I don't think the G-Man is necessarily evil..I think he just views humans as a lesser species and therefore doesn't really think our suffering is a big deal. Perhaps his relationship with humans is like our relationship with dogs. Dogs are our pets. We live with them for 8-10 years and then put...
On the subject of why the Zombine only has a lower jaw left, I think it's a plot hole of sorts. Originally, and I have proof of this, the normal Zombies only had half a jaw when you shot the headcrab off. Valve later added the bloody human head. I beleive the half-jaw is simply a placeholder...
Using info_landmarks and such, teleporting in mapping looks instant. Think of Ethernal Silence, you're teleported into an off-map location when you fly into the hangars.
Valve doesn't use rar files. They use GCF compression. If you do own a Steam Account, simply select HL2 in your Steam browser and click install. No manual installation, or rar files, required.
The people in this thread that complained about bad gameplay are the the type of people who buy games just to shoot enemies and blow things up. Satisfying? Yes. Everything? Definitely not.
Valve are developers. They try new and unique things. And that's why Valve is superior to all other game...
The reason why there wasn't an animal population is probably because Valve didn't want to take the time to painstankenly model, animate, and code them all. There was going to be a rat, apparently, but it was cut for some reason.