It is not just drafting a QB early, it is getting the right guy. The other Carr, Harrington, Leinart, Losman, Ponder, Boller, etc. are QBs I don't want.
I think football outsiders did a 20 year analysis and they basically concluded that drafting QBs early is better but the hit rate is still pretty crappy.
All draft picks have a chance to fail. So do top-10 WR's, pass rushers, offensive lineman. The list is long for every position of top-10 busts.
For some reason, people remember the QB's but that shouldn't STOP you from taking the most important position on the field as early and as high as possible if the talent is there.
And there is still overwhelming statistical proof that the higher a player is drafted, the more success and production they produce.
Too many people think that if Aaron Rogers dropped in the draft, that's the way to get a QB (see the Browns).
Too many people think that if Joe Flacco could be taken in the middle or round 1, then the answer is to get the small-school kid.
Too many people think that there has to be a Tony Romo or Tom Brady buried in every draft and that's the way to go.
The problem with those scenarios is they are EXTREMELY rare and random in their success rate. I have yet to see statistical evidence that ANY of those methods of trying to procure a QB can be scouted and predicted and planned on.
The best statistical way to get a QB in the draft is to draft in the top-5 or top-10.
Eighteen to Twenty of the opening day starting QB's are going to be top-10 picks. That's a pretty statistical dominance that no other position exhibits (maybe LT comes close). And that's when you consider over the last 12 years, there might be 25-30 top-10 QB picks but there are literally 120 non-Top-10 QB picks in drafts (about 10 others a year).
So picking top-10 you might hit 50%. Drafting anywhere else? You drop to 10%. And that 10% success rate could really come from anywhere. Late 1st round, early 2nd round (common right now), late in the draft (becoming more rare).
Those are the odds as an owner you have to overcome even if your GM and scouting staff are telling you something else.