Man, I tried playing HL a few months ago. Years ago, my younger brother introduced me to CS. I played that for a few months, and wasn't that great (although I'm quite good on Halo, Goldeneye, and other console FPS.) My dialup versus other peoples'cable/dsl didn't help though. Anyway...I tried playing HL to give it a go, and damned if my mouse hand wasn't hurting within an hour. Couldn't keep going. It's been so long anyway, I wasn't interested in trying to beef my skills back up.
God CS was a freaking fun game.