I like it so much I had to quit 2 days ago. I was spending far too many nights up until 3am in warzones when I had to get up for work at 6am.
I think the balance is pretty good. All of these classes that I have can be considered OP at various times, and at other times they get their butt kicked:
Pyrotech Powertech
Jedi Sentinel
Sith Sorcerer
Guardian
Assassin
Huttball was getting a little old though. But the first 150 times playing it was fun.