- No customizability. For example, I can't figure out how to have the clock on the taskbar also list today's date.
Point the First: Customization = bugs. For every checkbox in the OS, you double the time taken to QA. Windows has been reducing customization to ensure they can ship a quality product. (OS X has always followed the same philosophy.) So if that's what you're looking for, Windows isn't for you... but I also think if you were rational about it, you'd prefer a well-tested OS over one that's customizable.
Point the Second: Windows has shown the date on the Start bar by default since Vista. Please update your rhetoric to Windows OSes shipped during this decade, thank you.
I actually wonder if one of the reason Linux users think "Linux is just fine! It's just as good as Windows!" is that they're always comparing to a 10-year-old copy of Windows.