Whoa, blow me away!
Graphics: 11/10
I have a Radeon 9600XT 256Mb video card, and this game has yet to be surpassed in the graphics department. No first person shooter comes close to the texture, smoothness, and detail of HL2. A must see.
Sound: 10/10
Everything sounds as realistic as life, with full surround too. If you're not looking for a "Saving Private Ryan" movie, this is the next best thing.
Gameplay: 11/10
Again, superb, in the way that "almost" everything in the environment can be manipulated; whether it is by blowing up, putting on fire, throwing aside, or using as a barricade. (Even the paint cans actually work)... This results in one thing: a near infinite ways to play around in one scenario, and this means MORE replay value!
Value: 9.9/10
Well, this game IS new, so it IS quite expensive. However, what can you hope for, when the rest of this game is so good?! If you don't have the cash to shell out for this baby, at least go download the demo version via steam.