He put up the best rookie year for a QB since Marino. Better than Luck, better than Ryan. It's true that his surrounding team was great, but his first season puts Roethlisberger, (who had a great receiver group, a great rushing attack, and unlike Dak a great defense) to shame.
No rookie, no rookie, no rookie, has ever walked in and put together a 16 game passing performance as good as seasoned pro bowl QB.
I get this board is all about seeing the half glass empty, but by any objective standard Dak played like a top QB. Which is why he took ORotY honors in a season where he was competing with Zeke Elliott. It's why he had a post season performance as good or better than any of Romo's playoff appearances.
He showed more promise than any rookie QB in a generation, it's not an opinion, it's a verifiable fact.