Half-Life's "look" was as I expected. No big surprise, aside from the new crosshairs. (Get to that later)
Basically, your dumb ass ripped a hole in space to an alien world and now they are running loose. You are not some rambo type though, and still dont even have a weapon. You run around panicked for a while with no way to defend yourself. (Bummer)
You are not alone, as there are guards and scientsts throughout the game who are in the same predicament you are in. The scientists are pretty much wussies though, but dont cap them in the head or anything. It seems to offend people. (The guards shoot at you)
You can of course run, jump, crouch etc. as with any 3D shooter. There are a few changes out there including a reload key, which I'm not exactly fond of. Why not hit the +use key when not near any usable items and save a key? Another new addition is the "superjump" which is if you hit crouch and then quickly release and follow it up with the jump key, you jump extra far (about double regular distance. Not much higher though). This will probably be one of the first moves that advanced players just use an alias for instead, but makes for some nice gameplay changes.
Weapon selection is done through cycling different numbers. Much like Doom2 when you had the single barrel and double barrel shotgun. A pretty little hud pops up whenever you are selecting weapons. Hit the 3 key a couple of times, then hit fire and you are good to go. Having to cycle through up to 4 weapons with a single number is a bit irritating however. I imagine there will be direct impulse keys to select weapons for players like us. :)
Oh! I'm Excited! MORE! --->