I guess I have low standards.
The PP seats on the 787 were fine for my wife and me when we flew from ORD to HND. The PP seats on the 767 were also mostly fine.
The one place where UA could do better is offering lounge access the way JAL and ANA provides lounge access to their PY passengers, but that's special icing on the cake. And really, push comes to shove, I could just pony up ~$40 for the lounge access.
As long as none of seat pitch, seat width, and recline angle is reduced, I'm sure I'd be fine with it.