One of my favorite moments in World of Warcraft was one of my biggest achievements. I accomplished by finishing the battered hilt quest and had obtained a weapon called Quel'Delar, the Might of Faithful. It was a long, painful quest I've ever encountered and at the end I was mesmerized at the Sunwell in 2010. The feeling was like, "Wow!" Hehe.. Screenshot enclosed below. 

My favorite moments in wow, were the massive world pvp battles in silverpine forest. Show up in the location and have Alliance and Horde staring each other down in the hundreds of layers. One person moves forward and the giant battles begin!

When I first got the game I was torn between getting it or Everquest 2. (they came out a few months apart from one another), I decided to try WoW, since I loved the previous World of Warcraft games. 

I've always loved hearing/reading stories of dwarves and their trials and tribulations and their craftmanship.  So, I was very, very excited when I was able to actually step into the shoes of an actual dwarf (a female one at that).

Playing through the starting area was fun, the Scottish accent had me laughing out loud, but it wasn't until I walked up a hill on a path and saw the entrance to Ironforge that my mouth dropped open.  The entrance was intricate and ornate and just how I pictured how an entrance to a Dwarven city would be, but so much more.  Upon entering the vast Ironforge, my mouth remained on the floor.  I was just enamoured by it all.  It was actually a living, breathing dwarven city.  The stories from my books came alive on my screen.  The thing that made it better....I was now a citizen of this great city that my dwarven brothers had built.

I knew then that I had made the right choice in which game I had chose.

An interesting side-note - I have yet to feel that same feeling upon entering any other cities of any other games I have played.  Ironforge still holds a special place in my MMO heart for the feeling it game me that day.

@launch: first time I took a taxi, ending flying and seeing others characters below me actually doing things.

That was wow!

My favourite moment was when the whole server was doing the AQ Gates quest series to open and the map was SO, SO flooded that it caused crashes, not to mention the whole lot of wpvp going around! It felt like an awesome adventure..being careful all the time in Silithus..doing things around Azeroth to try and complete the chains..and watch the server crash! lol

Another one great..was the freaking first time I saw THIS

Man the goosebumps!!!

My favorite moment...well there is only one...one as memorable as the time when Swifty got banned by blizzard and all of the server and almost all of WoW banded together to spamm the servers, sometimes even crashing them, demanding that Blizzard unbann him, and it came true....greatest moment i ever seen and made me go wow....truely shows the power of the ppl when together united, can get things done.