Worse than ever? AE for me has been pretty solid for years. Most issues have been from third party plugins, rather than the software itself. Like any new update to anything, I've been weary to jump straight in as it's difficult to debug all the configurations out there, but at least they're attempting to push forward (abet their priorities with regards to new features over core performance enhancements is a little skewed!)
AE CC 2015 can be most charitably called, "a work in progress".
Adobe's re-writing a LOT of the core code to make it faster & more efficient -- a huge honkin' task that takes a lot of time. But to hit the deadline for releasing CC 2015, they left stuff undone, broke some long-functioning features, and turned other features off.
I'm not sure when this epic workload will be completed, but until then Adobe counsels patience.