I know that feel bro...i also got myself a ps3 recently...was a gamer for many many years on the pc...but hey once u get the hang of it...it aint that bad...but until today i haven bought any fps on the ps3...

if u wanna use kb + mouse go back to pc lahh...almost all FPS are multiplatform. or you can use ps3 sharpshooter...better than kb+ mouse....imma buy it when there's more games for it