This module helped me out a great deal. It does what it says it does, and it does it well.
Its value to me wasn't in its interface though, but the source code: it taught me a number of tricks about SOAP::Lite that I wouldn't have easily figured out on my own. [This is why I give this module a 4 for documentation.]
SOAP::Lite::Simple has one big drawback, in my opinion. You see, it dispenses with the OA part of the acronym (Simple Object Access Protocol), and makes you deal with XML directly instead. The beauty of SOAP is that you can access a remote web service just like any other object: call methods on it, pass in native data structures, and receive native data structures back. This module forces you to convert your input to XML before you can send it to the web service, which makes integration with the rest of your code more tedious than necessary. [This is why I give the Interface and Ease of Use a 3.]
That being said, it does make interfacing with a .Net service a whole lot simpler. Handrolling all of that SOAP::Data::Builder stuff is tedious and easy to get wrong. [Hence the 4 overall.]