So I'll play devils advocate and repost these, to show that clear graphical leaps are possible and very doable at the start of a generation. Anyone saying this leap isn't significant is flat out lying! (come at me d21lewis, come at me)
Don't forget that these first HD 360 titles are of course rendering at a much higher resolution than their SD counterparts. I expect 'next gen' games to still be running mostly 720p, leaving more of that new power for graphical effects etc.
Kameo when it was releasing on Xboxhuge:

Kameo on Xbox 360:

And offscreen:









