Well, while we are on the subject of various versions of Windows, I think Microsoft released Windows 2000 at the time they did because of delays and also because of the fact that the most current NT-based version was from 1996. Also, if anyone remembers correctly, wasn't Windows 2000 to be released originally as Windows NT 5.0?
As for Windows ME, I had nothing but trouble with ME. It was unstable, crashed multiple times per day, and just generally sucked. A friend of mine, however, got himself a nice Sony Vaio in early 2001 and that came with ME. He never had a single problem with it. All of his problems were with 98 whereas I had no problems with 98 at all. So really, I think that if a computer came with ME from the factory, then it wasn't all that problematic. But then again, I've only known a handfull of people who used ME, so I can't really say much on that.