Both CGI.pm under ModPerl::Registry or "Perl Handlers" are low-levelish stuff ... old and well documented, but low levelish nonetheless

You can learn a lot of stupid things cruft from CGI.pm documentation, and the mod perl docs can teach you how to do low level CGI.pm correctly (as required for registry) ...

Some things I said regarding mod_perl and CGI.pm Re: Perl and Fastcgi + template system (confused), Re^2: handling form data (mojo dance)/Re^4: handling form data (mojo dance)

Please, I don't want to make comparisons with the new frameworks. I just want to hear opinions from someone about mod_perl and CGI.

Well both CGI and mod_perl are environments , they're not frameworks, so there is no real comparison between them ...

Ok, mod_perl is interface to "Apache framework" but that is not a general framework

Food for confusion thoughts

web applications: what is the correct way to realise web applications, Re: I want to professionalise my quick-and-dirty web app, Re: I need wisdom on structuring procedural code in Catalyst

Clean URL RESTful,
modern ways of doing web services, API Development,
mod_perl website structure, How does Dancer handle forms? How do other such frameworks do it?,
Squatting, If you're using CGI.pm and following CGI to mod_perl Porting. mod_perl Coding guidelines you're 98% modern , only 2% away from using any "modern frameworks" which have a response object