I have a DS8 and a DD6. We have a PS2 and a GBA.
As long as homework is done, stuff is picked up, etc., they can play.
I don't let them play too much but they do enjoy most of the games they have. It amazes me how coordinated they are when they play.
They still play outside, we play board games, etc.
They like Nicktoons racing, Nicktoons Freeze Frame Frenzy, some of the Spyro games and Crash Bandicoot games. DD, a kindergartener likes the same ones and she has a Mickey/Minnie kitchen game where she can make recipes.
I wouldn't worry too much.