Does what is says on the tin.
I admit i've only played it for a couple of hours on my DX10 vista machine with everything maxed but i haven't had a single major bug crop up. It installed ok, although it did take a while (about 25 mins).
When i first tried to play without using a windows live profile it said that my progress wouldn't be saved. Im not sure whether this meant my statistics just wouldn't be saved online or whether it really meant i'd have to start from scratch every time i played so i decided to use windows live.
This is when it told me my windows live needed updating which it did automatically, although i had to exit the game for it to finish updating which i WASN'T prompted to do but i'll let them off that little oversight.
Then i had to create a windows live account which is very easy especially if you already have a msn email account such as hotmail
So all in all it took about 35 minutes from start to finish before i could actually play but this is the only downside to this game.
The graphics are pretty cool mainly because of the motion blur and field of view distortion. Without these i dont think the graphics would be anything to write home about, sure the player models are nice but the scenery just kinda does what its supposed to do without being over impressive.
Perhaps i would have been a little more impressed if i hadn't already had a go on the crysis demo :) which raises the benchmark some
Anyhow thats me done, im going back to playing it now. I dont know how or why a couple of people out there have had bugs (i assume they're using a legitimate copy of windows to play it- if not then its probably down to some old bugged system files that they cant update)