How many "first" should it take you? What's the average number of "firsts" the good defensive lines have?
I think everyone on your defensive line should be a first- or second-rounder unless you happened to get lucky with some of your shots after those two rounds. We have gotten "unlucky" with picks like Charlton and Gregory, to some extent; and we'll see on Hill. If you get a stud defensive player from the third round on, you should feel fortunate. They are out there, but it's not that easy to find them.
Frankly, we never should have had to draft Taco because of Gregory. That was the first failure that led to the second one. So our need to draft DEs (or sign someone like Quinn) has been exacerbated by those failures.
Until this year, though, we had not addressed DT with an early pick since 2005 (and we drafted Spears then to play 3-4 end). In a defensive scheme that calls for a dynamic player at 3-tech, this is a sore oversight.