HL2 was too scripted. People jumped up and down about how much better it was than Doom3, at least the imps in Doom3 through fireballs at you AND lunged now and then. HL2 just had combines with scripted entries that fired until you killed them or they killed you. Dont get me wrong, it was a great game, but giving bots more hit points doesnt make the game harder (as long as you know how to shoot). Personally I hate that. I mean damn it, if I shoot a guy in a head with a gun, he's down, maybe he's not dead, but he's down and that's all I care about. It's like the less than 100dmg headshots in CS:S, wtf? Harder difficulty levels should focus on faster, more intelligent enemies.
P.S. - Damn it, I missed out on FC cause I was working several jobs that summer (only got to play Doom 3), I'll get it for winter break though