Perl 5: Paradigm: Yes* Perl 5: Paradigm: Yes*Perl is no less or more maintainable than any other programming language. It just depends on the developers you use that particular tool. And the whole "Perl promotes unreadable code" is really a thing of the past; modern Perl has come on leaps and bounds.
"Function Overloading" should be "N/A" for a language without subroutine signatures. Any Perl function can take any combination of arguments and decide what to do with them. This is used to create de facto function overloading.
"Method Pointers: No" is ridiculous. Perl has subroutine references, which includes methods. You can even use a method name string as a method reference if you need to.
Don't take it too seriously and you will see there is a more than a grain of truth in what he says.
http://ian.hixie.ch/career/resume.html
http://lxr.mozilla.org/mozilla/find?string=PLIF/
http://software.hixie.ch/utilities/cgi/data/data.pl
http://software.hixie.ch/utilities/cgi/pingback-proxy/server...
Everyone is entitled to their own opinion though :)