It's probably ok. The heat system is constantly evaluating itself. Try if you have one running an intensive game or program, like Photoshop. You should hear the fan on more often since it's having to deal with more heat. If your system starts randomly crashing every so often, then it may be overheating.
JjP: I also think that apple products are generally better, but it's hard to fight Apple's corner on this issue due to the problems users of the macbook pro have been having with their systems getting too hot.