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I've been running Mac OS X for about 2 years now and in that whole time nothing has crashed (other aside than IE which i haven't used that much and have replaced in favor of Mozilla, Camino & Safari.) All these things i've heard about Mac OS X constantly crashing and the GUI wouldn't let people delete things i've never experienced nor have i heard from anyone I've ever meet having any significant difficulty with Mac OS X.
From a PC users point of view Steve Jobs has gotten Apple set up to regain what it had by introducing Mac OS X and new hardware. The only people i can see having difficulty are the ones who complain that the one specific app i ran doesn't run on Mac OS X or they don't like the way it runs in Windows on Virutal PC. I've run lots of things from MS Office, Visual Studio 6 & .NET, Personal COBOL (which is unfortunitly required for some classes i take), Some nice custom apps people have written. The only thing that you could complain about is running games which says something about you if you are stupid enough to run games (other than onces like solitare or chess) on Virtual PC. The only thing i don't like about VPC is sometimes it starts up slow, but you have to take into account it doesn't matter what hardware you run an emulated OS on, you are runnning your native OS and another OS on top of that so the emulated OS will always be somewhat slow.