For most of the Perl::Critic policies, you can find a complete explanation in Conway's book "Perl Best Practices". If you're still not convinced, then you can always disable them. And if you stongly believe that a particular Policy should not be followed, then you're welcome to write a contra-policy (for example: ProhibitUnderscoreSubs). Perl::Critic is all about encouraging consistency. You can make whatever rules you like -- Perl::Critic is just there to help you and your team stick to those rules.

-Jeff