The good thing with Mac is, he is still a rookie, he might not be prime TB but he is a very servicable QB. The best part on him he is very coachable, and is driven to succeed. He has enough talent to lead the Patriots to a SB.
But like all other QBs you have to have still a good team around you, even the GOAT scored like 0 points against the Saints, you can't block, throw and catch at the same time. Put Mahomes on the Jets won't make them AFC contenders without Kelce and Hill and a somewhat good O-Line...