Save yourself some time, get all the videos on one page here!
Halo 4 trailer
httpv://www.youtube.com/watch?v=TC2yMKMENdg
Arkham City: Catwoman Trailer
httpv://www.youtube.com/watch?v=9dXo3MNuJIw
Assassins Creed: Revelations Trailer
httpv://www.youtube.com/watch?v=Wo6Q14vBB1c
Call of Duty: Modern Warfare 3
httpv://www.youtube.com/watch?v=CblUvlZDio8
Mass Effect 3 using Kinect (ps fuck off Kinect, this is fucking awful)
httpv://www.youtube.com/watch?v=xY7S3_08FPM&feature=relmfu
Uncharted 3
httpv://www.youtube.com/watch?v=Ii1fUbxRThY
Skyrim
httpv://www.youtube.com/watch?v=UTURc3Fv8Xs
Battlefield 3
httpv://www.youtube.com/watch?v=9UwOrl036_A
Playstation Vita Game Montage
From Gametrailers