You're entitled to it, but both WMP and Real are very well behaved on Macs. They don't install, or even try to install any crap background programs or rootkits or whatever they're called now. They stay quiet and come up when they're supposed to. Aside from the fact that WMP cannot play WMP10 files, I'm happy with both of them! Not that QT doesn't treat me better...don't get me wrong. But they really aren't so bad on Macs.
In my experience WMP is really awful...it doesn't work well, and won't delete when I'm sick of it.
RealPlayer, on the other hand, is quite nice. It sources off of the Quicktime architecture so it can play other file types if you choose, and it's clean and simple, while running decently snappily (unlike the tank that is WMP).