3. Perl is weaker in certain key areas. For example, Perl is much less strong in GUI comparing with java or Microsoft products, and strong GUI support is such a high criteria in many projects. It made Perl less likely to be able to penetrate this area seriously. On the other hand, the question would be whether Perl actually seriously targeting certain application areas.

I dont tend to agree with this statement. It is just as easy to create a GUI (on windows anyway) using Win32::API as it is in C, where you must use native API calls also to get a GUI. While this requires a fair bit of work (and probably a bit of research) it is not all that hard, if a little repetitive.