I can think of a couple ways to counteract the negative review. Firstly, create a list of your module's strengths. Since you only first released it a few months ago (according to the "Changes" file), you must have done some research which led you to believe there are some advantages over other similar modules, such as:

• Unique methods/functions
• Convenient methods/functions
• Optimized for speed/memory/whatever
• Portable across unix/windoze

You should mention some of these advantages in the module's POD, instead of down-playing it, as you are currently doing.

Secondly, consider promoting your code by participating more in on-line forums, such as PerlMonks, if you are not already doing so. For example, answer questions posed by Seekers of Perl Wisdom, and offer your code as a potential solution, where applicable. Demonstrate to the public that your code is indeed valuable by providing concrete examples to solve a problem. I learned about many of the CPAN modules I use today because I saw others posting code here at the Monastery, not by reading a CPAN review.

By the way, I have seen other authors post reviews of their own modules when they release new versions. It is a good approach.