Just like you, but maybe to a lesser extent, I don't trust my MacBook completely although it's not even a month old. Having seen 1 MacBook experiencing so many problems and two completely new MacBook having problems out of the box, I find it hard to trust my current MacBook. I always use it with expecting at some point I'll be experiencing problems again. Only time will, I just want to be wrong.
My Windows XP computers on the other hand have been rock solid.
Although I like OS X a bit more than Windows XP, I am not going to say that one is better than the other. Each has its strengths and weaknesses. Watching Flash video using IE on Windows will not drive the CPU nuts. Try the same thing on a Mac, and the fan will go crazy. Working with multiple opened windows on OS X is, however, a way better experience.
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Patrick