Sorry, empty forums are very upsetting.
As one of the unlucky souls not to be able to justify spending £350 on a console and a couple of games, I've had to relay on going round a friends, and playing on his. And I'm unimpressed. We spent a good few hours going through a number of the demos, and having a quick blast. Not a single game felt "Next Gen". Sure Burnout had cooling looking damage, but nothing else jumped out at me.
We ended up playing Geometry Wars, which is fundamentally a 16bit game.
My list of Next Gen is: Overpriced, Over-hyped and Internet Enabled.
So I must have missed a game which makes NG shine. Which will make me want to go out and buy a nice new shiny toy (and HD TV). So what is it? What game should I try?