General Discussion

Ok, I'll play:

PVP                                        : Lineage 2/Guild Wars
PVE                                        : World of Warcraft
Character customization (appearance)       : City of Heroes/Villains
Character customization (skills/abilities) : No idea
Best visual/graphical effects              : Lineage 2
Most bug free                              : World of Warcraft
Most bugs                                  : Vanguard (though I hear it's better)
Best community                             : Lineage 2 (my preference)
Worst community                            : No idea
Best immersion                             : DDO
Most “grindy”                              : Lineage 2
Least “grindy”                             : Guild Wars
Best interface                             : World of Warcraft
Longest played (total time)                : Lineage 2
The one (or more) you “keep coming back to”: Lineage 2
One you would NEVER go back to             : Vanguard
Most overall fun (could list more than one): Lineage 2, Guild Wars

Bonus question - Most anticipated MMO      : Aion

PvP
Eve-Online and GuildWars, for different reasons. GuildWars is pure PvP, if you skip the PvE. I actually like it. Liked.
Eve-Online has that "I am part of a huge war and will change history"-PvP. I love it for giving me that feeling.
PvE
Who cares for PvE? Guildwars i guess. At least it has the most interesting Quests.
Character customization (appearance)
Can't really comment on that, because i do never really care for it.
Character customization (skills/abilities)
Same as above
Best visual/graphical effects
Best visual Style-Award goes to Eve. It has its edges if you look closely, but the overall style is great. Same goes for Guildwars, the visuals are extremely good, even on really low end machines.
Most bug free
Guildwars again. I have not encountered any.
Most bugs
Vanguard?
Best community
Eve-Online. Most mature community i have ever seen. Even the ones who get spanked are mostly nice and your arch enemy greets you. Mostly.
Worst community
Guildwars. I do not play f2p-games and heard very bad things of their "community", but of all the games i own this one has the most childish, immature and stupid community. Actually, it doesn't have a community, but a horde of barbarians as players.
Most “grindy”
Lineage 2. Hands down, this game IS pure grind. It is made of it.
Least “grindy”
Eve-Online. Nothing forces you to do anything repetitive to progress (although it helps).
Best interface
Eve-Online. It actually feels like the UI of an operating system. But it does it's job very, very well. After that, my vote goes to Gw. Again. That "mmo" is haunting me somehow.
Longest played (total time)
Eve. I have two accounts, that counts twice i think.
The one (or more) you “keep coming back to”
Still Eve. I take breaks from time to time, but return to it. It spoiled any other mmo for me..
One you would NEVER go back to
Swg and Guildwars. Swg is dead for me, Guildwars community is braindead and grouping is a pain. (May be because i like to play healers. You know who is responsible for a wipe, don't you?)
Most overall fun (could list more than one)
Eve-Online > Swg > UO > Guildwars.
Bonus question - Most anticipated MMO
Wurm Online. Terraforming, farming (literarily. Sow, rake, farm, bake bread), building stuff. I love it, for it's hardcore.

PVP                                        : Planetside
PVE                                        : Hellgate
Character customization (appearance)       : City of Heroes
Character customization (skills/abilities) : SWG (orig)
Best visual/graphical effects              : Lord of the Rings
Most bug free                              : City of Heroes
Most bugs                                  : Most MMO's
Best community                             : Planetside
Worst community                            : World of Warcraft
Best immersion                             : Planetside
Most “grindy”                              : Everquest
Least “grindy”                             : Planetside
Best interface                             : Hellgate
Longest played (total time)                : Everquest (4+ years)
The one (or more) you “keep coming back to”: Planetside
One you would NEVER go back to             : Everquest
Most overall fun (could list more than one): Planetside/Hellgate

Bonus question - Most anticipated MMO      : Warhammer

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PVP   I consider it a bad mistake to lump all PvP together so  I will split it up.

Best match play - Guild Wars.  Best World PvP, I guess EvE because its the only one with real world PvP.

                                  :
PVE  I can't say each have their strong points.  I would go with CoX and DD.  I can't fairly rate any EQ clones I am simply tired of them and find them boring.  Not saying they are bad just saying I can't rate them fairly.  I never liked EQ either.                                        :
Character customization (appearance)    CoX, is this even disputed really?   :
Character customization (skills/abilities) CoX the IO system is huge, Guild Wars and Eve as well :
Best visual/graphical effects  This is pure taste but Guild Wats, LOTRO, and EVE            :
Most bug free                          Not sure, Guild Wars seems really solid.  WoW is good buut there are a number of long standing bugs I know of.    :
Most bugs                                 Neocron, although I know of others I haven't played that are probably worse :
Best community                        CoX     :
Worst community                       Guild Wars     :
Best immersion                         Really depends on the activity DDO can be good while solo in a dungeon, Eve can be very immersive, CoX is great when you are jumping across buildings etc     :
Most “grindy”                           EQ1?  FFXI? CoX; depending on how you react to spawn model  :
Least “grindy”                          Guild Wars   :
Best interface                          Guild Wars for slickness, old WoW for variety   :
Longest played (total time)              Not sure actually  :
The one (or more) you “keep coming back to”  None:
One you would NEVER go back to             :
Most overall fun (could list more than one) :

Bonus question - Most anticipated MMO      :