HL2 is freakin' weird.
I get the impression you're SUPPOSED to feel disoriented and confused, since Gordon is just dropped in the middle of it all out of the blue by that freaky g-man guy.
The ending is more or less right too - There will be a HL3 don't forget, so cliff-hangers are good

My biggest gripe was the game was so ****ing boring. I mean, it looked fantastic, and the kinda stuff you could do with a small crowd and several grenades...! Phew, haven't had that much fun since Max Payne 2 and that part where you have to defend Baseball Bad Boy from a bunch of guy who are climbing over a wall (Into my grenades :evil grin:)
However, the whole game was basically me running away from... well... everything and shooting lots of stuff. HL1, as a game, was MUCH better - It had a VASTLY bigger variety to the kind of things you had to do.
I'd say HL2 compares to HL1 the way Deus Ex 2 compares to Deus Ex 1, or the new Starwars Trilogy compares to the Original Trilogy.
It ain't *really* bad, but it it ain't that great except for the eyecandy...
And it CERTAINLY wasn't worth the amount of ****e I had to go through to get it running.
In fact I ended up borrowing my mate's pirate version since I never managed to get my LEGIT one running after 3 days ot trying... like Tiara I took it back for a refund after I completed it. Whenever I wanna look at the game again I just watch the HL2 speed-run AVI on the PlanetQuake SDA, it's a lot more entertaining than playing the game, and that is a really bad sign...
I also found out that you need a STEAM account just to play the DEMO... if more games mfgs. start doing this I think I'm just gonna boycott them all... it's not that hard atm since I have bought maybe 3 games in the last year (It's depressing how nobody seems to be able to make a game that grabs me anymore... and to think Bubble Bobble once had me addicted enough that I played it's entirety without stopping, whereas no game this year has come even close to that...)