My personal opinion about these results:
First, I would be very curious if they include all the copys that were sent out to customers that purchase ATI cards.
I was deeply concern about getting this game because I knew it would be heavly ATI bias - but some of recent non-ATI reviews, show my card - 6800GT doing very well.
I think that HL2 could even get more growth if they came out with an update to make it Performed on NVidia's cards in method that it should. It only helps the popularlity of the game to work better on NVidia cards. Especially with the success of 6 series.
I am not playing the game currently, I had a problem with sound looping, ( same as Star Wars Battlefield ) nad got the hardware issue and now I can play Star wars.
. I may try it HL2 later.. But that it is just me. But the big one is coming for me - LOTR: Battle for Middle Earth.