Athleticism, especially elite athleticism has always been viewed in high regard because it cannot be coached into a player. The things a coach can do with a player only go as far as the talent he's working with and that applies all the way down to youth sports. You can coach the mental side of the game into any player, but you cannot coach more physical ability into him and I think that's where all the pushback is coming from against Mac about being drafted at the top of the first round.
I haven't heard any of the prognosticators say Mac wasn't worthy of a 1st round pick. As a matter of fact, all of the ones I've heard talk about Mac believe he is definitely worth a first round. However, when a team is drafting in the first five picks and the position of need is QB, they cannot afford to miss and miss on someone who they knew going into the pick was the least athletic of the top quarterbacks. People get fired over risks like that because it sets the franchise back another 5 years. Granted, if the risk works and Mac turns out to be the next Tom Brady or even Kurt Warner, those that drafted him will be deemed geniuses.