Seat size and leg space can be pretty limited, but I’ve never encountered anything completely unacceptable in my many times flying.
Tell me you’re under six feet tall without telling me you’re under six feet tall.
The headrests don’t hit my head, my knees are jammed into the seat in front of me, the tray table sits directly on my thighs, and if I get a leg cramp I just have to sit there in pain because I can’t straighten my legs or stand up straight in the cabin. But the good news is I can see everything everyone in front of me is doing on their screens.
Honestly I’d be happier in a coffin in the cargo hold.