So I have a level 26 Jedi Knight (Guardian) and a level 25 Sith Warrior (Marauder) and I love this game so far. I feel the melee classes are a little underpowered and look forwards to my Trooper Healer (Level 10). I think I'll get my Knight to end-game first, then my trooper. My Sith Warrior is on Anchorhead so I probably won't play him too much.
The story telling really makes the game fun, and I can't wait to see what BioWare does with this game.