Personally, GW2's character models and combat system as well as the art look ridiculous to me. I can't play a game like that xD
WoW, on the other hand, has kept me engaged for years and i play everyday constantly. I'm not sure why people are getting turned off from WoW just because of a few changes. It's still the same game to me. You'd have to be the most ignorant fool on the planet to berate a game company for making the changes that blizzard has to WoW. I am rather biased though, i say don't waste your money GW2 doesn't even look good. But the quest system is supposed to be very intuitive and evolved so if you're into that, i'd say give it a shot.