Why do you think Justin Herbert is good? And why do you think Dak is overrated? He's easily better than his contemporaries Goff, Wentz, mariota and cousins.
"Easily better than..Wentz..and Cousins"
How on earth did you come to that conclusion?
I will give you Mariota, I've never rated the guy I rate Prescott over him although he did still beat Prescott in Dallas and Prescott blew that game with poor play to kill them off early doors.
Over the last two seasons...
Cousins has thrown 56 touchdowns 16 interceptions with an average QBR of 103.6.
Carson Wentz has thrown 48 touchdowns and 14 interceptions with an average QBR of 97.7.
Dak Prescott has thrown 52 touchdowns and 19 interceptions with an average QBR of 98.3.
Jared Goff has thrown 54 touchdowns and 28 interceptions with an average QBR of 93.8.
Wentz has a ring and Goff has been to a Superbowl.
Arguably Prescott had the most friendly offensive conditions during that time (and the prior two years). Vikings O-Line only improved last season, Wentz has largely been throwing the ball to deck chairs, especially last season and Goff suffered last season with his O-Line being considerably worse, it was a mess last season after losing pieces to pay Goff and Gurley plus decimated by injuries.
I personally consider Wentz the best quarterback out of the lot. The guy has carried his team in numerous games and played a central role in the Eagles achieving the #1 seed en route to winning the Superbowl. Yes people will claim he's never on the field even though he just played in all 16 regular season games.
But whatever way you chop it up, Prescott is clearly not "easily better" than the aforementioned contemporaries - and when you throw in the eye test, it's even clearer.
Prescott is pretty much on par with the likes of Cousins and Jimmy G. I don't understand why people get so worked up about that! They are all good quarterbacks.