I wrote about annoying customer service surveys here.
I recently started using Skype and after every call, EVERY CALL, they ask you about the call's quality. Bad mistake.
In trying to find a solution to this problem, I came across some great examples of why over-surveying is a bad thing. From some forum posts:
"If i would have know that every 3rd call, it's going to open up my web browser with no ability to toggle it off, i would have not purchased it. In addition, i (ALWAYS) click on the lowest rating when it brings up that quality feedback web page, despite how really wonderfull the quality of the call was, just due to not being given a choice about the popup."
"Why not let users have the choice of giving feedback or not ?Amen.
Since eBay took over I've seen a variety of these type of things that control your user experience.
Like the previous poster, if we all put in negative feedback in the voice quality page perhaps Skype will realize that the loss of real feedback is a serious enough problem to allow free choice for the user."