While I haven't stumbled upon a script that could automate the process of 'evaluating' the quality of your perl code, there are plenty of online and print resources you could find helpful.
Perl Best Practices (
review) by O'Reilly is invaluable in that regard.
Some other online resources on the subject:
Ten Essential Development Practices
"Best Practices" at the monastery
Slashdot discussion
Common Perl practices (novice traps)
Perl style guide
Perl guide on DBI - since often used in cgi...
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"We've all heard that a million monkeys banging on a million typewriters will eventually reproduce
the entire works of Shakespeare. Now, thanks to the Internet, we know this is not true."
Robert Wilensky, University of California