Played the IA to Nar Shaada so far and I'm disappointed. I like the whole secret enforcement for the Empire thing, but I'm just not feeling it. Sith Warrior is fun. Basically kicking butt and taking names and beating on the people who try to put you down. Sith Inquisitor, you're basically someone's hoe until like the last minute... I have a weird thing for Khem Val, though, and the game play is all lightening-y and I love it. Bounty Hunter, thus far, is great; Running around capping people on the bounty list to be the very best, like no one ever was... Only played a little of Jedi Knight and it's... less satisfying. Save this guy, save that guy, save this planet, save the galaxy. Jedi Consular isn't much better... diplomacy and not stepping on people's toes and all sorts of roundabouts. Smuggler is okay, though up until NS it's random and kind of all over the place. Which fits the Smuggler just fine, so there. Trooper has been getting a lot of crap but I'm liking it a lot so far - it's a classic tale with a bit of a twist and overall, like I said, it's enjoyable. But really, just like everyone else has posted, the 'best' storyline is subjective and there isn't really a widely-accepted "Best."