Basically the impression of M::B is: It produces distributions that are unbuildable from CPAN. It doesnt (or didnt) run on Win32.
Hey, EU::MM doesn't run out of the box on Win32 either, because it requires nmake! And if a module includes XS, it doesn't really matter what build system you're using, because most Win32 folks don't have a compiler installed. Win32 Perl has always had more problems installing modules, thus the existence of PPM. The fact that Module::Build didn't work great on Win32 in the past (though I think things have changed) is simply because the lead developer doesn't use Win32. When Win32 folks like Randy Sims and others have stepped forward to help make it work, they've been welcomed.
The people involved don't seem to listen unless your name is widely known in the community already.
Uh, you keep saying stuff like this, but your only support for it appears to be that you made a suggestion on the list that wasn't accepted. I know Ken personally, and I've been on the M::B list, and I just don't buy this at all. Not every suggestion will be accepted. Things will be done that some people disagree with. That happens all the time. Do you agree with every decision made in regards to CPAN, or PAUSE, or the Perl core, and so on? Of course not. That's the nature of projects that impact a lot of people.