I agree he probably should be right at 80 (2 pt difference)....however, it is important in regards to overall to only compare players to their peers at the same position! If you notice, it seems attributes for PG's as a whole impact overall rating more, compared to attributes of centers. I don't think it is 1:1 comparable, void of position. Just something to keep in mind!
I'm quite pleased with the ratings out of the box. They are better than I recall them being in recent memory, if not ever! We can argue rookie ratings, but their performance will justify adjustment to those as the season goes on. I think most of the stock players are rated fairly accurately, with the major points of contention (in my mind) only meriting a change of 2-5pts OVR. A quality job by Beds, in my opinion.