For me it would be....

- BF3

- D3

- GW2

Again just my opinion with my playstyle.

only 3?

how Bout

SWtor (dec 2011)

Tera

TSW lifetime sub

GW2

Diablo 3

Torchlight 2

Heroes of Might and Magic 6 (cause I was bored)

Ill eventually add Storm Legion to this list I am sure, but having fun currently

If by "waste" you mean games purchased but don't enjoy, then there have been several for me.

Diablo 3 - I purchased Diablo 3 a few weeks after release. I was up late one night and a friend convinced me to get it. So I buy it, finish the download, then as soon as I get into game and roll a character, my power goes out. For almost a week (a storm with a combination of living in BFE). Seeing as how Diablo 3 is blatantly cursed, I called Blizzard support and got a refund (so I suppose it was only temporarily wasted).

WoW Mists of Pandaria - No clue what I was thinking here. Random spur of the moment purchase. Perhaps I'm just longing for the days when I really enjoyed my time with WoW. Purchased a month with it as well, and rolled two toons, got one to 12ish and finished the pandarian starting zone. Never touched it since.

Guild Wars 2 - It's just not my cup of tea. I put ~80 hours into it (far less than I hoped/expected to) and I have no urge to play anymore. I suppose the only saving grace here is that if anything ever does get added to the game that I may enjoy I can just install it again and play.

The Secret World - This is a toughy, because there was a fair bit I liked about it (setting, questing/story, ability wheel, etc), but I didn't play past the first month. The combat felt fairly drab, I played solo (my fault I suppose) which probably wasn't the best idea, and there are several systems I like in MMO's that TSW doesn't have.

D3

I feel as though I got my money's worth out of the few other games I purchased this year (GW2, TSW, TERA). Diablo 3, however, is a steaming turd of a game.

GW2

Tera

D3

DF:UW  oh wait too early.

Torchlight 2.

star wars

tera

gw2

all a waste of my money but a lesson learned.

im done with thempark garbage.

Honestly the only one I can say I don't play anymore is Guild Wars 2.

I won't go into detail but it wasn't what I thought it would be.

I still play Diablo 3 so I wouldn't call is a waste.

I am now thinking of getting Panda Land for WoW since it's 20 bucks... but I know from my past experience it won't worth it.

Everything else I have been trying for at least a week before I decide, and well those f2p models are just garbage.

Lets see...

GW2 (population died so much, my entire guild just stopped logging on and my server is dead...thought the game was good though)

And...

That is it actually. Really wish I spent that 60 dollars on kickstarters or other games.

All my other games were either given to me, I won in a giveaway, or I had no regrets buying. I actually have very few games I bought this year. There really wasn't much I was interested in. The only next major release is Far Cry 3, but I can't afford it.

I bought 4 or 5 games in total this year. I bought Unreal World (3 dollars), a WoW month (recently, 15 dollars)...umm kickstarted Starforge (15 dollars)...guess only 3. No I bought Towns too...very fun as well. And I guess Arma 2, but that was mostly for DayZ

2 came for doing a survey for GOG

2 came for a free gift on GoG

got Don't Starve (steam) for free on another forum, I was trading something for it, dude didn't want it and gave the game to me anyway

friend gifted me Civ V expansion (I bought Civ bundle back in Christmas sales for incredibly cheap)

Kind of a small selection compared to last year (Skyrim was my favorite, still play it)...but I bought so much during Steam's sales back in 2011...probably the same again in 2012. I tend to only buy games on sale, save a lot of money.

TSW - combat got old and the enemies got boring

Tera - wasn't realy able to find a class I liked, will say the it was the smoothest running game on max settings I've ever played on my 7 year old rig.

D3 - lazy game with lazy animations that kept my attention only enough to complete its short campaign.  Loved the cutscene though

Until I saw this thread I didn't even realize the sad truth: I only purchased one damned game this year; DayZ (Arma 2). It was most definitely not a waste. But, sad nonetheless, as I typically pick up way more titles per year.

If DF:UW doesn't work out for me (very doubtful), I might have to accept the fact that I have another gaming hiatus, much like the one I took in the late '90s, right in front of my face.

I'll have to be careful though, I foolishly missed out on some beauts the last time I went "dark". I will not allow lightning to strike twice.

Tera

this is probably the most beautiful game I have  played graphically but the game was/is a quest hub wow clone. Great engine terrible gameplay design.

Swtor

Highly enjoyable single player game advertised as an mmo. Hilariously silly engine problems.

GW2

i honestly thought it would give me more than a month. It did not, now theres a gear grind in place so I wont be back. great engine good game design. Not designed to be a primary mmo so I don't feel too ripped off on that one. I savored the trip to max level on this one too didn't rush at all.  

Each one of these games took years to make sweat and long hours and I tossed them inside of a month. I just need to stay away from mmos that are targeting the mcdonalds gamer. Got some great prospects coming tho NeverWinter Archage Repop Black Desert. DFUW

1. Twisted Metal

2. D3

3. Gw2

Diablo 3: Leveling was alright. Didnt have the hug maps like D2 did which was a bummer but endgame was really bad. It was farming rare packs over and over again. And if you werent a barb or monk you would get oneshotted. 

MoP: Cant believe i let my friend talk me into buying this. Did recruit a friend and got a monk to 87 before i realized it was the same ol shit all over again. My friend who still plays tells me he logs in does his dailies, heroics and RF if he has to then log outs. Its still a glorified lobby game.

SWTOR: Even tho its a dec 2011 release its close enough for me to put it on this list. I bought the CE and i actually loved the CE but not the game. Leveling was fun because of the story. I would have preferred non mirror classes and less linear questing but it was alright. But the nail in the coffin was the endgame. I was one of the first snipers on my server so i got to see a lot of it due to my high dps. After the amazing story you either grinded huttball, heroics, or did the buggy ass raids. Swtor is truly the epitome of an mmo failure.

Tera: While i loved the graphics and combat the grindy linear quests really threw me off plus the over the top asian look to the races. The Elin were extremely weird and it threw me off.

3?

I only bought 1 where I didnt get my moneys worth thoguh....

And thats Cubemen.  Then again it was only like 5-10 dollars

A Game of Dwarves: Horrible. Just horrible. Bland and confusing graphics, terrible AI, and cheap mechanics.

Torchlight 2: Incredible disappointment. Game is boring, classes uninspired, skills are dull, enemies are repetitive, illusion of choice, no respecs, lack of closed online (leading to rampant cheating), and framerates dropping to nigh unplayable levels during big fights all added up to make one steaming pile of crap. Glad it was only $20. Original was much better.

The Secret World: Wanted to love it, but the faults were just too much for me to bear. Insane amount of bugged quests, so-so animations, finicky performance, some of the most repetitive combat ever, badly designed skills / trees, lots of grinding. I wish it the best for its ideas & innovations, but I just can't bear to play it.

Honorable mentions go to GW2 and MWO. MWO doesn't really count though since I got a refund (props to Pirahna for that, TBH).