Yeah, the PS3 game selection is still a bit limited, but it should be growing fairly rapidly by the holidays as well. The target audiences seem pretty clear for both the PS3 and 360...and it isn't the same crowd as the Wii. Childish games can be entertaining, but they also tend to get boring faster; for me anyway. There are some good games, but there aren't any truly epic titles for the PS3 yet IMO.
My son has a Wii and he says the games are too easy, even Resident Evil 4.