I played it a good while back ( 6 months or so) with a friend, we had a total blast for a few nights of playing and then he went on holidays and I got completely bored on my own, stopped playing. I think it's an excellent co-op game as that allows you to do dungeons and heroic zones (we 2manned everything, was challenging but very fun), but its not so good as a single player.
I also played it at closed beta/pre launch and got to 50 on my Jedi, liked some of the main quests but found the game a bit tedious, at max level I felt I had nothing left to do. Have been considering going back for another try but wanted to try out this Elder Scrolls Online beta. Can't say I enjoy that too much, i'd have bought it if it was a buy to play like Guild Wars 2, but not for a subscription.
I'm on the shelf about re-subbing to SWTOR, it's a good game with friends and they have done a lot to fix it from what I'm told.