very late response so late nobody will probably ever read it here goes ...Well I'm currently playing Crysis 2 demo , i'd rate it as a demo ( 9/10) multiplayer and its really a lot of fun a bit similar to halo and call of duty rolled into one.. only 2 maps but those are pretty good ones.

also I'm playing Nail'd demo I'd rate it as a demo (8/10) , two courses and can customize your quad its a challenge for me and very hard to win !!!

Also the Call of duty black ops demo, i'd rate it as a demo (8/10) for those that haven't got around to purchasing the full game yet is good stuff you get to complete a full mission, the combat is intense and varied but be warned after its finished you will probably get the thirst and want more you can select your difficulty which helps add to the demos longevity .. there's no multiplayer with this its a single player event and there's some bugs not many and hardly noticeable but its a generous demo and a worthy contender to check out if you haven't already