Is SWTOR worth resubbing?

I bought and played SWTOR during launch but unsubbed before my first month ended. I didn't have the time to invest in an MMO plauged with typical MMO launch problems. I played Sniper and felt I was underpowered and when I wanted to switch to Operative it wouldn't let me, is this something that's fixed? Is there a dungeon finding system?

TL;DR : Has SWTOR been tuned up since launch? And does it have more features that make the game easier to enjoy? IE dungeon finder, more balanced classes.