...and that's my own frustration with these sort of threads, the assumption that, if i'm having an issue with the OS, everyone else is too. that it's not 'mavericks is not working well for me', but that 'mavericks sucks' etc etc..
The problem is not with these sorts of threads, but with Apple refusing to teach it's users how to safely test a new OS in a separate partition or drive.
All it would take is a link in the installer such as "Learn How To Safely Install This Software", which could link to something like this:
http://apple-mac-blog.com/osx/1-step-1--how-to-install-osx-mavericks-safely.html
The problem is that Apple insists on pushing the fantasy that it's safe for everybody to install a new version of OSX on top of an old version. The truth is, it might be safe, or maybe it's not. In other words, you can't count on it.
All these sorts of threads are Apple's fault, one for not finishing software before it's released, and two for not teaching it's users how to safely test a new OS.
This doesn't mean Apple is evil, it means Apple is stupid, for pointlessly putting big dents in their world class brand.