I love Purdy. He is efficient, confident and makes good decisions quickly. He does things off-script pretty well too and is a good enough athlete to get 5 yards and a 1st down. He won't wow you with any plays but very rarely is going to make a mistake. I think he's better than Tua in a very similar system. There is a reason he's only lost 5 (not counting the NFCCG last year) games as a starter, one of them being the Super Bowl in which he had a lead when he left the field.
To say he's just a game manager is absurd. Scouts missed him, it happens. He will be in the top QB group for a decade