I appreciate that we're still referencing Passer Rating on this site. If we're doing that, then all the Vikings fans should be happy they have Cousins for less than top 5 money (he was 4th in passer rating in 2019 and 8th in 2020).
In 2019 Dak was 5th in yards per attempt. He was 27th in number of sacks even though he was 6th in total attempts. He also fumbled only 2 times in nearly 700 plays. He was 4th in ESPN's QBR. He was 3rd in Expected Points Added per play, behind only Mahomes and Lamar Jackson.
Dak Prescott is EASILY a top ten QB.
Until Dak proves he can win in the playoffs or even consistently in the regular season there is no way he's a top 5 QB right now. He was 8-8 in 2019, it's not like he has had bad teams either.
In no particular order here's my top 5 QBs in the league:
Rodgers
Mahomes
Wilson
Allen
Watson
my next 2 would be Brady even at his age has been better than Dak and L Jackson. Brees is retiring so he's out of the question now. After that I think the argument can be made is Dak really any better or significantly better than Stafford, Mayfield, D Carr, M Ryan, K Murray, maybe even Tannehill or potentially Herbert too? Most if not all those guys have a lot more to show for results than Dak does. I'm a Chiefs fan so I have no bias or allegiance to any NFC teams but I just don't see the value of signing him to a top 3 QB deal for a guy that has won just 1 playoff game and is borderline top 10 QB in the league. I hope for Cowboys fans sake he proves me wrong but this could be a bad contract if he doesn't take a step forward and take the Cowboys somewhere in the playoffs soon.