Not surprised to see him being mentioned among top prospects. I think GMAC will go higher than expected. He has an adequate skill set, a great football IQ, and an above average mental capacity to continue to learn, grow, and adapt at the next level.
On the right team, he could be very productive in the future. I don't think he is a QB that needs to be rushed to start as his skill set is not as high as others. His edge comes from his competitiveness and drive to better himself. If given time to learn the offense he is in, adequately adjust to the speed of play, and truly get a feel for the NFL game, he will be a very good QB for someone.
I think the Pats would do very well to take him as their 4th pick overall (puts him in the 2nd round), but gives them a quality QB to fill their #3 QB slot behind one of the NFL's best current talents. It would be the perfect situation to facilitate GMAC's growth in the NFL and give him the best chance of long term success (IMO).