I really liked Force Unleashed, enough to buy it for the Wii and then later the Ultimate Sith edition for the 360. I still prefer the gameplay in the Wii version though.
For the sequel I'd like to see a bit more effort put into the overall pollish, the first game was good but looked very poor in places. Other than that more of the same would be great.
It also would be nice if there was motion plus near 1:1 lightsaber control but if not then I could live with the directional attacks of the first game.