TF2 is a blast. I agree w/ Batman that Medic+Heavy is not OP'd if you just work on killing the medic.
However, I'm still having latency issues due to my wireless network. BUT - moving from 802.11g to strict 802.11b cut the problem in about half, but it's still not as good as wired.
(Any suggestions? All firmware is up-to-date, router is ~6 feet from the PC, etc...)