Apple has pushed out yet another un-tried and un-tested release for iOS 8. There are too many issues to list out here. 8.0.1 worked better on the iPhone 5.
For starters though, FaceTime appears to be quite broken in different ways and combinations. Extremely laggy on the iPad 3, not that iOS 7 was a speed demon. The only way to fix the intermittent issues seems to be to reset the device, and the issues come right back after sometime. These are results from a clean restore of iOS 8.0.2 since 8.0.1 had issues when upgrading (according to Apple).
Nitin Chandra's Blog 