From everything I've read, HL2 is Full-Scale Proof of Technology demo, and nothing else. Steam apparently makes Windows 9x/2000/XP look like the most effiecient, streamlined piece of software ever written. And the apparent level of support provided is akin to what you'd get from the drug dealer in the alley.
I wouldn't install HL2(and all the crap that goes with it) if you paid me to.
Don't misunderstand, I did like the first one. It was a little overhard for a pickup gamer like me, but on the whole it was okay. The story just never really grabbed me like the Homeworld series, Command & Conquer, or Diablo.
Hype is fetid mouthwash from the advertising department that is designed to make you salivate when you see an ad for the game. It is, most of the time anyway, overblown propaganda. Remember Freelancer? It was billed as the greatest space trading sim ever. What we got was a good third-person, space-combat game. Hype is worth less than the energy required to come up with it.