I actually liked Episode 2 much more than TF2.
And, as far as online gaming goes, I'll take the perfected chaos of Halo 3 (awful campaign, great deathmatch) or CoD4 before I take TF2.
My list would be:
Orange Box as a whole
Call of Duty 4
Civ 4 expansion
Notably absent is Stalker. I found that game tedious and tiring. Too much walking back and forth. Too much travel. If I want to waste time traveling back and forth and encountering very easy enemies that I often run from simply to save time I'll fire up one of the SNES Final Fantasies.