The suggestion for rating download drove me to suggest the equivalent for payware
The goal is not "I paied then I am right to rant" but rather give informations to potential buyers about what they will find or not in an add on.
If an add on overwrites some modules or effects in such way all FS behaviour is modified, it is wise to know it BEFORE. If a given plan is provided with a good panel, here also it is good to know it. etc.
I just bought last week for the first time a payware plane and, to be honest was desapointed. Not to tell it was crap but so many free planes are so much better...
In summary: it would be nice to find some information about what we buy.