Weirdly I've had one noteable crash (that wasn't me messing with hardware) on windows since probably 7. However on my rMBP I get semi-regular blackscreen/beachball lockups & reboots - granted it's anecdotal, but my OSX experience has generally been worse than my windows one. Terminal, Trackpad, Keyboard (pre-butterfly), paw & sketch are the only positives I get from my MBP.