So, I managed to fix some of the worst things about 4.2 for myself:
Random reboots and crashes: UNINSTALL HD WIDGETS. NOW. It has some serious compatibility issues, and I haven't had a reboot since uninstalling it.
Screen flashing, washed out colors, poor brightness management, poor battery life: Install lux. Done. You still might get screen flashing in very specific scenarios, but, for the most part, it fixes everything.
Dolphin crashing randomly: install " browse faster" and " jetpack"
Random reboots and crashes: UNINSTALL HD WIDGETS. NOW. It has some serious compatibility issues, and I haven't had a reboot since uninstalling it.
Screen flashing, washed out colors, poor brightness management, poor battery life: Install lux. Done. You still might get screen flashing in very specific scenarios, but, for the most part, it fixes everything.
Dolphin crashing randomly: install " browse faster" and " jetpack"