Here's a very good article from footballoutsiders.com that pertains to this subject.

NFL Draft: Round-by-Round QB Study (1994-2016)

It lays out in detail every QB drafted during that stretch of time and goes into their success, or lack thereof. It groups them by round and degree of success within that round. One thing that jumped out at me was the lack of success of QB's drafted in the third round or lower. Our very own Aaron Brooks was identified as "The Good" amongst other 4th rounders. I couldn't argue the fact looking at the others.

But also note the lack of success in the earlier rounds. There were 57 first rounders (272 QB's overall) drafted during that stretch. It's scary looking through the list. Only 16 made "The Good" list and it appears accurate to me.