I gave them the 44 bucks just for TF2 and it's been easily worth it. Chances are I'll never even play EP2. Never cared for HL2's single player game after the gravity gun is introduced.
Portals looking pretty fun as something to mess with. So 44 bucks for a killer online fps to play again and a decent puzzle game. Thats easily worth what I'd blow in just my first hour of buying drinks at the bar.