Here's a list of some of the issues:
Newer versions of the MacBook Pro shouldn't have these issues anymore, Apple claims. They also say that if the MacBook Pro becomes hot to the point of being uncomfortable, you can bring back your MacBook Pro and they'll give you an updated version.
AirPort does not automatically rejoin a preferred network after waking up from sleep mode. This does not happen with my PowerBook. Settings are the same. AirPort would drop down to nearly 1 block randomly once in a while. This also does not happen with my PowerBook. At the lowest screen brightness setting (one block), the LCD's backlight flickers noticeably. This is pretty annoying. Heat is a big issue. The MacBook Pro gets so hot that I cannot place it on my lap if I'm wearing shorts. And even if I am wearing pants (instead of shorts), it's still very uncomfortable. Using the AC power, the palm rest area becomes very warm, and the area above the F keys is very hot. I do not notice this with the PowerBook.