Long time Fedora user, since RH8.
I upgraded my main workstation from F21 to F22. F21 was totally stable and great. F22 has been nothing but trouble.
The main issue I have is session freezing that appears to happen right before the KDE (Plasma) desktop is displayed. I have this problem with both nVidia and nouveau drivers.
The kernel seems to run fine. I can ctrl alt F3 and start a console session and it runs fine. But I can't get a KDE (Plasma) session to run at all.