Wildstar didn't feel very innovative to me. It felt like it was trying to re-capture vanilla WoW just with a space cowboy theme (and somehow managed to feel a lot more grindy in the process). Tera on the surface is actually quite fun. All of the classes and the combat was enjoyable, unfortunately the quests are basic kill/collect from start to finish (and if there was a story I never found it).
GW2 has its pros and cons. The combat is sort of love it or hate it. The lack of storytelling made the game feel like more of a sandbox. When things happened you weren't sure why you were supposed to care. I liked the level scaling and the boss events. Their PvP system was also fun.
As much as Rift was ridiculed for being a 'WoW clone', they had some great features I always wished Blizzard would 'borrow' like Chronicles (1-3 player versions of raid content). Not to mention dynamic events. At this point, I believe WoW may be one of the only MMOs that doesn't have dynamic events.
ESO's single-handedly the best MMO on the market right now if you're a quester. Sadly, I have great difficulty running it on my (old) PC.