I purchased half life the week it came out and was thouroughly disappointed with the single player. Maybe Im just hard to please but i found it totally boring. I gave up after a few days and could never be bothered again. I simply wasnt interested.
I remember half life dm being quite good fun though when i first played it. And it was with baited breath that I downloaded TFC, followed by months of TF heaven. TF was and still is one of my best gaming experiences ever. Then along came CS, which I loved (dont play much now)
So I would say f*** half life 2. I WANT TEAMFORTRESS 2. Even the best single player games pale compared to an inventive multiplayer game.