I played the demo too. At first I wasn't terribly impressed. Then I played it again, and there just seemed to be something there, so I took the chance and bought it. The demo doesn't really begin to do the game justice. It's from very early in the game. It does give you a good idea for how the battle system works, but it only introduces you to a fraction of the type of stuff you'll run it. The last few missions had my jaw on the floor. I was like, "you want me to do WHAT?" It was a good challenge, but not so hard you're all, "MAN @#%^ THIS GAME."
Just right on length too, I think my final save game had about 34 hours on it, but that was with me doing all the extra side missions and skirmishes that aren't required.
It does offer you a "New Game+" type mode when you beat it. There are a couple of extra side missions and "Hard" mode is unlocked on the skirmishes. I'm tempted to take that for a spin, but I sorta want to start playing Disgaea III.
Edited, Dec 19th 2008 2:53pm by Usagi