it was pretty good. we had a 45 minute demo set in a mid game raid. the characters were set to lvl32, and we had to run through an area and then go up against a double boss where they would revive each other if you didn't bring one down within 5 seconds of the other. i didn't get to spend as much time with it as i would have liked because it was a 3 hour wait to get in, and i had a panel i really wanted to go to soon after. So, my group was kind enough to rush through the area, bypassing what enemies we could, only fighting the ones we couldn't or accidentally pulled, and then i died quickly during the boss battle. i left then, and one of the bioware guys sat in for me so i didn't ruin the rest of the party's experience. still got a t-shirt, though, so that wast pretty nice.
Oh, and i played as the Jedi knight (spec'd as an off-tank), and the others were the trooper (main tank, ranged), Jedi consular (dps), and the smuggler (healer). normally, the smuggler and the consular would have switched roles, but i think they spec'd them that way to show the versatility of the classes so people aren't shoe-horned into a role if they really want to be boba fett, or whatever.
And that 3 hour wait? Yeah, that was pretty much 10 minutes after the show floor opened. they capped off the line 20 minutes later, and it was looooooooooooong.