The fact that this is not shows that not many people (here) agree. :)
I personally have no opinion on DB schema because I never looked that deep, but last time I had to deal with WP its codebase was just horrible. And don't get me started on plugins' code quality, it goes to entire other level of "horrible". The project might have a lot of talented contributors, but they seem to be overshadowed by everyone else.
They might have fixed it from the last time I looked of course (though I doubt it, judging by never ending stream of vulnerabilities).
