TF2 is a very cool game; too bad I have the 360 version and not the PC version. Valve makes awesome shooters; HL2 is pure genius; there's a reason it's ranked like 8 on Gameinformer's top 200 games.
Also, if you don't know how to bold text, you might not be very awesome.
TF2 is one of the best multiplayer games out there right now, still, and with Valve being Valve and actually supporting their games after they're released, it's likely to maintain that position for a while, especially if new content continues to be released regularly.