Name them... all of the QBs you see as being better than Cousins.
This isn't exactly in order of how good they are but its numbered to keep track of how many I view as better.
1. Rodgers
2. Wilson
3. Brady
4. Wentz, unless this knee injury completely ruins his career, which seems unikely
5. Brees
6. Newton, though like you, I do find him maddening at times, his ability to take over games is as high as anyone.
7. Luck, or at least he was pre-injury, I'd rather have his injury uncertainty, than a player I know is much less talented.
8. Stafford, I think he is less teammate reliant, and more consistent than Cousins, but they have a lot in common.
9. Roethlisberger
10. Prescott, I'd put him and Cousins in the same tier, but I feel Prescott has a higher ceiling.
11. Winston, same as Prescott, but with an even higher ceiling. He's really underrated in my opinion.
12. Rivers
13. Ryan
14. Carr
15. Smith
16. Taylor
That's 16 guys with at least 2 years starting experience. I'd have no issue if somebody also preferred Garappolo, Watson,or Goff but my jury is still out on those 3.
Cousins fantasy numbers mean nothing to me, he's gotten lots of yards because a Jay Gruden QB will get lots of yards, its just how the offense works. If Cousins had gotten hurt the last 2 years, Colt McCoy would have had some 300+ yard games. Not saying he'd be as good as Cousins, but you get the point.
My opinion of Cousins is that he's a slightly above average QB, who has benefited from a QB friendly coach and excellent supporting cast(especially in 2016) I think he and Andy Dalton are basically the same guy, and they both need high quality talent around them, or they get too turnover prone, and end up being problems as much as solutions.