I am only going to count PS3 games here because there are too many others.
1 RPG
2 Action Adventure
4 Shooters
1 Fighting
1 Platformer
All out of 9.
EDIT: But wait. Playfire does this for me :D
So, counting PS3, PS2, PS and PC games:
Action: 31.71%
Action Adventure: 26.83%
RPG: 12.20%
Shooter: 9.76%
Strategy: 7.32%
Sports: 7.32%
Others: 4.88%
That's not right...