I'd just like to point out that this is likely not to get better with this (arbitrary) decision to release a new OS every year. It used to be that we'd have a new release roughly every 2 years (from 2003 - 2011). This meant: 1. it was in development for 2 years and thus probably stabler to begin with, and 2) there were then 2 years to iron out the bugs. You'd get the new OS, there were some understandable kinks, but then by 6-12 months later it was
pretty solid and you had another year of a solid OS ahead of you. It was perfectly reasonable to wait on the OS and let the early birds kick the tires first.
This is no longer possible. It feels that as soon as version N is out, they are scrambling to make version N+1. There is no downtime. There is no stabilization phase. You are eternally in brand-new isn't fully working mode. Of course the software is going to be worse.
Couple this with the stark reality that Apple has simply run out of ideas in terms of software. Every new version of OS X boils down to: 1. arbitrary UI tweak (forcing developers to refresh), 2. Gimmick features in Mail.app/Safari (RSS in Mail/Safari, Postcards in Mail, yet another 3d effect to re-arrange your tabs in Safari, annotations in Mail, etc etc etc), and 3. regressions of features that worked for years. Occasionally .Mac/MobileMe/iCloud will be renamed in hopes everyone forgets about the last round of data loss bugs/hopefully people get excited about this vague thing they don't really know the scope of.