http://ctrlaltkill.org/2011/01/26/crytek-working-to-resolv-2-demo-issues/

According to the Crysis 2 blog at EA, Crytek is working to resolve technical issues with the demo that a few players are having on Xbox 360.

"We are paying close attention to the forums and online discussion . It's good to see many players having a great time. However, we do understand that a few players are having technical issues with the demo. We are working to resolve this as quickly as possible, and apologize if it is affecting your experience."

Crytek suggests that you report all feedback and technical 

issues at www.mycrysis.com/techissues.

What problems? I didn't encounter any of them.

yeah me too i don't know what problems their talking about. The online multiplayers is laggier than halo reach. I have never lagged in a game and im currently level 5, even though i only have half a meg connection

I thought the Beta was f'ing ace! Even though it took a bit getting into, the hit detection is REALLY poor at the moment, and people sponge bullets like there is no tomorrow, I think bullet deflection should be removed, it's WAY too overpowered, invisibility i OK but it's relatively easy to combat with Nano Vision, the guns were alright and the maps/perks are reasonably good.

I personally thought they should have thrown in another map for a little variety, overall I think it's one of the better Beta's I have played, I will most likely preorder the game later on.