>incompetent and ineffective?
Well it uses touchscreens for controls which have pilots hitting the wrong 'button' 1/5 the time. Stealth ability is gutted by wing mounted weapons because the the bay's ability to hold weapons is uncertain. Fuel is corrosive due to additives to allow it to be used as coolant and needs temp controlled storage. The airframe can only handle <3 g's making carrier launches damaging and thrust vectoring worthless. VTOL capability melts flights decks unless reinforced.
>Is it a liability?
With the number of crashes and excessive fuel storage requirements, I would say yes.
>Why stop building f-22's?
Corruption I bet. The tooling was destroyed so it's final.
It was supposed to be a F-16 replacement but everything got fucked up. Scope creep was the big issue, just kept adding capabilities until it became a giant mess. It is also likely that the airforce siphoned off funds for a new jet; they've already publicly disclosed they're working on one.