Sonic Unleashed
It's a real shame that the whole game couldn't be like the demo. Despite occasional camera frustration and slow-down-to-kill-enemies sequences, it is the best attempt yet - better than the first Sonic Adventure - at translating Sonic's high-speed action into a 3D game that is also fun. At least, the daytime sequences are. It's rather telling that the nighttime, werewolf sequences are omitted from the demo. Had they been omitted from the retail game, I might be inclined to play it, too.
Progress: Gave Up -- Finished the demo