It kind of depends on which particular version you've got, but most of the Atom Z series processors were actually worse at a lot of things than the N270 from the mini 9 and other netbooks at the time. This was back in the days when you really did have to choose between having enough horsepower to run a lot of things, and battery life. The Z series atoms and the NM10 chipset prioritized battery life above all else.

The one to look for might be the model based on the N450/N455 processor, but to be honest, gaming and netbooks aren't really compatible concepts.