The metro interface is far less functional than the Start menu, and does not replace it. The main things that can launch from Metro tiles are these miniature applications, or apps, not conventional programs, whereas the Start menu launches conventional, fully-functional software. The apps that launch from the Metro interface also don't do well with multitasking (at least more than one on the screen), as it is made to emulate a simplistic tablet-PC experience. These features should have been relegated to the RT version of Windows, not shipped with desktop versions.
There are many other problems with the UI as well, as some experts in computer interfaces have pointed out over the last few months. So I'm not jumping on the Windows "8" bandwagon, even though it may be a popular thing to do.
Incidentally, I was using MS DOS 6.22 and WFW 3.11 after the release of Windows 95, but that was more for financial reasons back then.
Also, do you any of you guys care to comment on why MS called it Windows 8, when it is really version 6.2? That is kind of absurd in my mind, especially considering Apple's naming system which keeps with their actual operating system version.