Originally Posted by
Derah
Mostly a combination of many different factors.
Take a giant pot, put in it SWTOR's deeply personal storyline with a highly customizable plot that changes as you do multiple choices before and after gameplay, add in the randomized large-scale event battles of Rift, season it with music made by Jeremy Soule (the genius behind the music of games like Skyrim Oblivion and Morrowind), add gorgeous graphics and art style, remove the necessity of tanks and healers, remove the need of high level gear in order to be efficient at your job, allow the capacity of battling multiple servers on large-scale battles, and spice it up with some great voice acting, and highly customizable appearance of your character, and there you have it.
IMO, without trying to offend anyone, GW2 isn't exactly a genre-buster revolutionary MMO, but rather a game that mixes the best of a lot of great games, while removing the worst of each, creating as an end result a really fun engaging game that also doesn't requires a montly fee to play (this right here is the main reason I even started to dig up info about it)
It does features some unique features, such as the cross-class combos, and a completely different mechanic for fighting on land than it is for fighting on water. But otherwise, its still at its core, an MMORPG.