Here is an excellent review and tests of Skype service in the U.K. In a nutshell, dropped calls, poor quality, no response from Skype.
Skype Drops the Ball on Free Calls
I would only add one comment. My brother tried to call me over the weekend, to use up the last few SkypeOut minutes that he had left since giving up on Skype a year ago. The connection was so bad, and the quality was so poor, that the first thing he said after I went to the computer and connected to him with ooVoo was "Thank God I'm not putting any more money into that Skype garbage!"