I've been in the Wildstar beta since December, though I haven't really played it in the last month. I didn't really like Wildstar, for several reasons. I never got particularly far in the game either, so take my opinion with a grain of salt.
First, you know how everyone in PvP runs around in circles like a madman? Wildstar is bringing that to PvE. I don't see this as a positive. Maybe I'm just getting old, but going nuts with the telegraphs like Carbine did made it a very tiring game.
And to a degree, Wildstar is a more difficult game than I think people will accept. I look at their dungeons, and I have zero desire to throw myself at that. In some respects, I think I'm just not skilled enough for Wildstar, so I may as well stick with more forgiving games.
Second, I never found a class that I enjoyed. I'm not really sure why. Just none of the classes seemed to have that factor which made me want to play them. The closest were the stalker and the engineer, but even they were missing something.
I don't really know how to explain it, but it feels very much like the classes in Warhammer Online. Those were well-crafted classes mechanically, but they just left me cold. Perhaps it is a matter of archetypes, of not having literary characters that match up to the class. Perhaps I play paladins because of Paksennarion, Michael Carpenter, and Uther, and not because of the mechanics associated with the class.
Finally, this is a very small thing, but in some ways it was the straw that broke the camel's back. I really, really do not like to be sworn at. It's just a reflexive distaste. So when the level up effect involves profanity, it just puts me off completely.
As well, if you think swearing is necessary, at least have the courage to swear. Bleeped swearing is a poseur's game. All it says is "we're trying to be edgy, but not too edgy." If you have to bleep your swearing, you really should just rewrite your content to avoid profanity.
So those are the main reasons I disliked Wildstar. I did not like their combat system, their classes left me cold, and the swearing on level up was a complete turn off.
Wildstar does have several good points. The graphics are colorful and cartoony. The game performance was good. The factions were reasonably interesting. The questing was pretty decent.
I also really liked the Settler path. I really enjoyed upgrading each quest hub with buff stations and building up the fences, and generally making the camp look better. The other paths were okay, but didn't really have the pull of the Settler path.
So those are my thoughts on Wildstar. I did not like the game, but it is not a bad game. If you like the combat, and find a class you enjoy, it will be a fun ride.