Graphics card

I noticed Team Fortress 2 has a discount going on. I don't know crap about computers so...
The system requirement says: GeForce 8 or higher. This laptop (MacBook Pro) has a graphics card called GeForce 320M.
Everything else meets the requirements. Google says the 320M should be fine. I have no idea, though.

Should be fine. If it lags a little bit turn settings to a minimum (doesn't look much different, to be honest). If it still lags, you can

do some more tweaking.

There's also a guide to run Nintendo 64 graphics, but that's for really, really, bad computers.

GeForce triple-digit line-up is the predecessor to the quadruple-digit GeForce line-up.

In your case, GeForce 320M > GeForce 8000 series.

Though, stepping into the realm of mobile chips, I don't know, but the GeForce 8 series is pretty old (only worth $20 now, which is practically free compared to $300 GeForce 470) so you're probably okay...

EDIT: It's a MBP? You'll be fine. My friend plays TF2 on his MBP.