You can break elementaryOS' nice graphics just by putting it into sleep mode and waking it up again - say hi to at least 2 different kinds of graphics glitches and possibly a randomly appearing bug in the file manager. And I'm not sure if it was a bug or a feature, but last time I used eOS I didn't enjoy the default video player's "fullscreen mode" in which it still didn't overlap the lower part of the desktop with the dock.
But keep in mind I haven't tried the most recent version which came out not long ago, I'd be surprised if some of the problems weren't fixed yet.
I think elementaryOS is on the right track, but it's definitely not more stable than the average distro, including the ones with rolling-release update models.