Being someone who codes almost exclusively for Win32 systems these days, I'd have to disagree. The quality of the Win32 modules does not reek of a second class effort.

As for scripts that have already been written, I might point out that perl wasn't always an easy issue with Win32 systems. If a script was written in the past, it was written for Unix. Recently, I've just started paying attention to the last time the script was edited. Relatively new scripts run on Win32 in many cases. I think with time these old scripts can be ported (a good way to spend time if this really bothers you that much) and that the perl community will learn better methods for writing multi-platform code.