Just wanted to comment on the whole lag thing. I downloaded the demo at my sisters house (she has a 46" CRT rear-projection TV) and playing at her house compared to playing on my 46" Samsung LN46A650 120hz LCD, there was noticeably less lag. Mind you, my sister is using composite RCA (I know I know, she needs to get an HDMI cable) - not sure if this has any relevance.
Anyway, the Samsung A650 series has known to have input lag. A lot of other LCD's too because of all the processing in the TV itself. That's why a lot of HDTV's have game modes now. Unfortunately for me, the A650's game mode prevents you from tweaking certain picture settings, and because I use my PS3 for both BR and games, I prefer not to use the game mode. But yeah, after playing at my sister's house, I definitely notice slight lag in the controls. This is the first game where I've noticed it, probably because GG made the weapons feel weighty. Playing at my sisters house, the controls felt great to me.
So yeah, if your HDTV has a game mode, I recommend trying that out. I'm tempted to get a standalone blu-ray player now so I can use game mode on my PS3 and use my calibrated TV settings for my BR player.