I too was a little disappointed with the (ps3) demo for the force unleashed. The graphics was awesome and, well everything else was well done; but I was also expecting a game similar to the Jedi Knight series.
In my opinion JK II: Jedi Outcast was one of the best online games ever, you had to actually practice to get good with the lightsaber. This made the game deeper than just, pick it up, kill some dudes, get bored, turn it off.
However, I will be buying this game when it is released on the 19th. Simply because it is a Star Wars game, and the geek virus I picked up when I was younger will force me to get it.
My liver is evil, I must kill it!