Firstly Sony tend at E3 to focus on several years ahead. Whereas M$ literally every E3 focus on the next 12 months.
I guess your forgetting the following games.
Star Ocean 4
Next Halo game
Cry On
Mass Effect 2
Alan Wake
Peter Jacksons Halo Project
Huxley( People forget this game is MMOFPS before Mag on PS3 was announced)
Lost Odyssey 2
Forza 3
Thiese are just off the top of my head and are all currently full 360 exclusives.