The "recommended CPAN modules" site has helped me make informed decisions:

http://www.perlfoundation.org/perl5/index.cgi?recommended_cpan_modules

I also follow the "Discussion Forum" link on each module's page to see if there is a forum, and if so, what level of activity it has.

Performing a Super Search here at the Monastery can also be quite revealing:

• Some CPAN authors provide continual support for their modules here.
• The Monks are not shy about voicing their opinions (good and bad) about modules, highlighting strengths and weaknesses.
• There are a plethora of real-life examples and usage scenarios for some modules.