OP seems a bit extreme. Did any of the real draft experts not expect him to be a 1st round pick? The draft is a crapshoot. Everyone tries to form an opinion because that is what they are paid to do. Reality is millions of dollars are spent analyzing guys and everyone still gets it wrong more often than right.
I would say most draft experts were right on Allen in many ways. I think what they did not expect is his athletic ability to translate so well to the NFL. That has helped give him the time to work on the rest of his game which he has done an excellent job of doing. When he was drafted most expected a bumpy ride, but also said the sky is the limit if he figures it out. That ride to the sky is getting much less bumpy. Enjoy it.