Mac OS X 10.8 bugs..

Is Mac OS X 10.8.4 more buggy than previous versions of Mac OS X? I encountered the first bug the first time I booted my new MBA. I don't remember anymore what exactly the problem was, but it was related to app store refusing to update iPhoto and two other bundled programs, repeatedly asking me to sign into app store (or something like this, and me signing in did nothing, it just asked the same shit over and over until I rebooted). And now, out of nowhere, Finder died on me and relaunching/killing it did nothing. It just refused to start. Again, rebooting seemed to have solved the problem. What the hell? I never had such problems with 10.5 - 10.7..