It is def a good choice for Kratos, but I think the actor should play Marcus Fenix if there ever is a Gears Of War movie.
I have played and beaten the first two God Of War's that are part of the God of War collection for the PS3. I bought God of War III, but still haven't played it yet, due to weird circumstances. The day I was going to start playing it, my hard-drive crashed. I will beat it eventually though.