Yeah, so I had a pretty good time at TGS. Here are my impressions from what I played...
KOF12-Obviously the build was nowhere near finished, but it played pretty nice and the new sprites work better than I thought they would. I went undefeated and got some card for it, Japanese players suck until they read their Arcadia.
Ketsui/DDP-Good ports.
Mirror's Edge-It was really hard to get a feel for the game since the demo was so limited, but I did like the style of the game and they really nailed the feel of Price of Persia in 1st person. I get the feeling that this game might lead to a revolution for 1st person platforming.
Resident Evil 5-Looks great, plays great. Ammo seemed really limited, especially since you also have to share it with your partner. Ran out of ammo on the chainsaw guy and got killed, that guy was tough, blew up a barrel next to him and he wouldn't die. Partner system is really cool, I like how you back each other up and separate to complete tasks.
HAWX-Has a lot of potential. The intercept system is neat, nice graphics and the demo level was solid. Auto-pilot is worthless and caused me to crash. It's like Ace Combat but without the awful acting and stupid storyline, I'll probably end up buying it when it comes out.
iDOLM@STER SP-Pretty impressive what they could fit on the PSP, full voices and the graphics are pretty good. They're closer to the arcade version, pretty jaggy and the animation isn't nearly as good as the 360 version, but I guess that's to be expected.
Fallout 3-Japanese people don't know how to play this game. The trailer is also god-awful since you'd never know it's an RPG by watching it. Other than that, I enjoyed the demo, but only time will tell if the leveling and the quests/stories are good. 15 mins of it didn't say much. Graphically very high quality.
Prince of Persia-Controls weren't as fluid as I would expect, but the graphic style is awesome and the fighting moves are really well done and flow with the gameplay. The demo area was obviously in a later area, so it was pretty difficult and I kept dying. You have to replay the entire section if you die, I kind of liked the time rewind system better, but whatever. Might be worth keeping an eye on.
I also played some crappy DS games who's names I don't remember. There was also some rhythm game for the PSP which name escapes me, but it was somewhat decent.
I'll post picz of kool cosplays eventually.