When other users here have posted that they have solved their problems with doing the various solutions proposed, and especially with the reset to factory default condition ... just that alone shows that there are problems that have nothing to do with iOS 8 ... because these users are able to get their iPads back to running condition and in fine order, without Apple having done anything else ... other than that user applying the solution.
Now, the solutions offered here ... are a variety ... and there are a variety of good results, but there are always "some" who find that user solutions will not help them. They can go to Apple Support (as Apple Support is not here on this forum) ... where they will get Apple's Official help ... of which it is the highest rated, by other users, in the industry.
The bottom line is that there are many users who have solved their own problems withe the solutions here, and others who have had no problems at all, in the first place. And as I have said many times before, that doesn't mean someone is not having problems, but it also doesn't mean that Apple is the cause of the problems either!
Apple Support
http://www.apple.com/support/
Apple Retail Store - Genius Bar
http://www.apple.com/retail/geniusbar/
Product Feedback
https://www.apple.com/feedback/