The Application Center is one of the most popular sections on our web site, generating many thousands of downloads each month from new and experienced users alike. End-users use it to find content that they can incorporate into their work, while contributors use it as a vehicle to publish their work. We have a few contributors, in fact, who use the Application Center as part of their CV.
We accept contributions from a very wide range of users, some who are new to Maple and MapleSim, and others who are experienced users going back many years. And while we review each contribution before we post, we do so primarily to make sure that the content "works" in the stated version of Maple. We do not test for compatibility with prior versions, nor to we test every algorithm and formula to ensure that they are mathematically correct. If there are any obvious errors or issues with formatting that can be improved, we will work with the author to improve it prior to release.
So while there is absolutely variance in quality of the materials available, the Application Center has been designed so that the community can provide feedback to the author and the rest of the community about its quality. The Application Center will then look at this feedback when determining where to include certain content. The best stuff will bubble up to the top, while the content deemed of poorer quality will sink down. We call this system 'popularity'. If you're interested in learning more about how we calculate popularity (or even better -- if you have some suggestions to improve it), make sure to check out a blog post written by Will Spaetzel that describes how the popularity system works.
The ratings slider is the easiest way to contribute your quality score for an application, but you can also leave opinions, questions or suggestions by using the comment section. Or if you'd prefer, you can even contact the author directly.
The Application Center also has an Editor's Choice section, which is content that has been handpicked by Maplesoft as the 'best of the best', and is usually a great place to start if you're looking for some good examples.
When it comes to comments, they are moderated, just as comments in our corporate blogs are. This is to prevent inappropriate language or spam from being displayed. We try to be as open as possible and have never, and would never, block comments that are legitimate opinions, corrections or questions regarding a particular application.
With regards to the Online Help System, there are no public comments available for that section and any comments that you provide, while greatly appreciated and read, are only used internally.
I hope this answers some of the questions/issues raised about the Application Center.