Atoms aren't THAT bad... I've been using netbooks for school, they're sufficient for note-taking and light web browsing.
It seems that games often over-estimate their CPU requirements - Fallout 3 for example - It's requirements claim it needs a 2.4 ghz processor, while i can run it on an Ion netbook running at 1.6ghz. Starcraft 2 is no exception - while the beta didn't run smoothly at 1.6ghz a minor overclock shoots into playable framerates.
Still, you're right - I don't recommend an atom for a gaming rig - but in the interest of a small budget, you can force a little more performance out than you'd expect
