I think what A LOT of people are overlooking is that... this is, in general regard, a DOWN year for QB recruits. Sims really isn't any more touted than McCarron was coming out of high school. Many of the QB's ranked ahead of AJ last year, could be argued as the Top Overall QB this year (had they only been born a year later).
I know, Sims is a 5-Star on Scout. But stars are awarded based on rank within the recruiting class, not talent! The rank is established based on talent. But what happens when a a certain position is lacking in numbers? It's pretty understandable for "the tops" at the position to recieve a little bump in their rank because they are essentially a "rare commodity." (I also believe this year's top RB are very subpar to last year's top backs- maybe it's just a down year overall).
Anyway, look at the Scout 300 over the past few years... They all have QB's ranked in the Top 10, if not better. This year's 300 is different. Heaps is the #1 QB at an overall rank at #21 - Sims is ranked at #23.
Or, look at the Rival's 100, who usually does a better job of ranking/evaluating. Heaps is the #1 QB, ranked at #63 overall. Sims is a few spots behind at #67. How does this compare to other years? In last year's Rival's 100, there were FIVE QB's in the Top 60 players (including 3 in the Top-20 - TWO in the Top 5). There were also 5 QB's in the Top 60 of the '08 class, with Pryor #1 overall.
Down year or not, one doesn't have to be an expert to tell that Sims is pretty special when it comes to throwing the ball. It just seems so natural for him and he has all the throws, not just a gunner with no touch.