When I was PC Gamer give Half-Life 2 a 98% my hype alert meter went off.
But now that I have it and have played it for a couple of days, I have to agree, it's pretty fantastic. The graphics are really good but more to the point, the physics of the game really lend themselves to making the game more enjoyable.
My only pet peeve are the # of puzzles that have to be solved. But it's forgiveable since if you have an engine like they have, it makes sense to use it.
I also have DOOM 3 and in my opinion, this is a far far better game than DOOM 3.