Nintendo: Mario, Zelda, Pokemon, Pikmin, Star Fox
Sony: Crash, God of War, Ape Escape, Gran Turismo, Sly Cooper
Microsoft: Halo, Forza, Fable, Banjo Kazooie, Conker
Edit: This was a list of the first five games i could think of. If it was a list of the reason why I like the company it would be like this:
Sony: Crash, God of War, Sly Cooper, Ape Escape
Microsoft: Banjo Kazooie
Nintendo: Smash (with almost everyone inside, so no one is missed :p)
We reap what we sow