The bar for a legendary quarterback class in the NFL draft has been set high for nearly 40 years. The 1983 group is still the gold standard. That's not only true from a performance perspective in the league -- John Elway, Jim Kelly and Dan Marino all went on to be Hall of Famers (with Ken O'Brien being no slouch himself) -- but also from a draft perspective as six quarterbacks taken in the first round is still the most of any draft in NFL history.
The 1999 class isn't remembered too fondly for its quarterbacks, but it's the only time in NFL history that quarterbacks went 1-2-3 in the draft.