Heavenly Sword had amazing graphics, and Lair plays at 1080p. I liked the art style in Folklore too, though its not as impressive as the other two. In general your games that are Xbox 360 ports are not going to have as good of graphics as your exclusives.
Sandytf, I am right there with you about 2d games. While most 3d games of the PS1/PS2 era look jagged and pixelated now, the 2d games with a bit of filtering still look as amazing on a 47'' HDTV as they did when they originally came out. The death of 2D is probably the greatest travesty in the history of gaming.
As for GTA4, first of all, you haven't played the PS3 version because it isn't out for another 2 days. So you have no basis for saying how awesome it is. The GTA series in general has had graphics that were mediocre at best, but this was required as there is a lot happening and all of it is streaming in realtime. As much as the PS3 and 360 add more power, the game also has even more stuff happening, so I predict the graphics will be nice, but not as good as games with a smaller scale.