To be blunt, it sounds like the problem is with you more than with the operating system itself
At least nothing that wasn't my own fault (I like to mess around with system files. Sometimes they don't end well, but I can usually fix the error without having to reformat, and this applies to Mac OS X and Windows, as well as Ubuntu).
I think you misunderstood me - Its not that I can't fix it -- but if I have to sit there for a week trying to pin down what exactly went wrong for no apparent reason (ie one day it works, next day it all goes to hell w/o you installing/changing anything) -- if it takes that long to find out what's the stupid problem, it takes less time to wipe, reinstall, recover and continue working. Either way, my point still stands; compared to Panther and Tiger, Leopard is a buggy turd.