My Macbook Pro i7 works terribly with Windows 7 via Boot camp but that's just one of the MBP users' cases.
The drivers are unstable and does not work as it's supposed to be on certain machines.
I went a lot of troubles with Apple support via online, phone and the B&M store Genius Bar and they never decided to not honor mine as one of the defects.
I've seen people who were having same issues including network instability, random freezing, problems related to sound, but also people who are running Windows 7 quite well. Same product, same driver, same operating system, but different symptoms.
The test to determine if these symptoms were random was done in right after a clean install of Windows 7. So it's a matter of luck, I assume.
All of the problems were able to be solved by finding a better driver, not necessarily newer one, but I have yet to find a sound driver that works properly for those who are having sound-related issues. The symptoms were such as randomly having no sound output while the Windows Sound Mixer clearly shows sound is on output by the active volume bar, or causing some CPU overload thus creating a lag when it's in zero volume state on software side.
Freezing issues can be solve for finding a right video driver, and for the network instability problem, it could be resolved by manually overriding a driver that was designed for a different network adapter which could be found somewhere over the net.
So basically replacing drivers with the right ones solves everything if you happen to pick up a bad MBP, but it would be quite an adventure until you have ones that work for yours.