Windows 7 rates my passively cooled Asus EAH4350 at "3.7". My system displays standard applications (Office, Firefox/IE, Photoshop, etc.) with no issues whatsoever. It also uses all of the Aero features perfectly.
It actually has a higher rating for games, but I've never played anything other than the card games that come with Windows 7 so I can't advise you much there. I do know that the Win7 card games are unusably slow on a system without Direct-X driver support, but on my card they work without any problems whatsoever.