No it doesn't.
Windows 7 runs just fine on a two year old Atom netbook that's about as weak a CPU as one can get.
Windows 7 runs just fine on my 2007 vintage HTPC that pumps out perfect Bluray and high-def video to my 1080p HDTV. Even back in 2007 when I first built the HTPC, it wasn't anywhere near the 'high end' even then because I wanted it silent/energy efficient.
PC users biased against Macs definitely have a tendency to spout total falsehoods about Macs and OSX, but it's only fair the point out the exact opposite is true of some Mac people constantly going on with total Windows falsehoods like none of us might happen to have used it anytime lately.
"lately" is the operative term in this case. We also haven't talked about the difference between optimal and acceptable performance- what do you expect out of your Atom box and will Win 7 work any better on a stronger machine?- I sure hope so.
Windows has "moods", it also is clumsy in general operation compared to Mac.
I admit I don't have firsthand experience owning Windows 7, but have firsthand experience from Windows 3.1 all the way thru Vista. I've been a Windows user literally that long. I STILL fix windows issues for friends, and those friends on windows still are trying to get their hands on Mac boxes. I don't expect some night and day difference between 7 and anything else they have done.
As a windows user, how often do you want to start from scratch and reinstall just to restore speed? How many BSOD's do you encounter, or just random bugginess? How many defrags do you do in hopes it speeds up your machine?
Like I said, unless you seriously have some heavy hardware it ain't gonna run right- because Windows is bloated.
It's basically ass-work to own and maintain a windows box unless you HAVE to have the software for work. It's because of all the bloat.
rjp