Well, there are plenty of threads about it so I don't want to hijack this one... but, to make a long story short, on unibody MBP's, BootCamp doesn't handle fan control under Windows, which leads the machine to run so incredibly hot that it eventually crashes and shuts down to save itself.
Then there's the glass trackpad, which I've heard lots of conflicting stories about, but they all seem to end with crashes, freezes and general mayhem.
There are a few other issues with BootCamp as well that make the Mac a crippled PC, such as the buggy Apple keyboard driver which screws up firewire performance, which means that people like myself who use firewire audio devices to make music in Windows, will get tons of crackling, dropouts and glitches in the audio. You can tinker with it and disable the keyboard driver, but then the keys get mapped all wrong.
Until these issues are addressed, an MBP may be sufficient for taking Windows for a quick test drive, but not for any serious work.