Our drafting/scouting/developing has been among the best in the league under Garrett, actually. At least most attempts to score drafts that I've seen, once adjusted for picks, have us in the top 5 or so, league wide. But this is exactly the sort of stuff we see from fans all the time, so I'm glad you pointed it out.
Here are a couple of attempt to quantify the impact of drafting and developing. They each use slightly different methodology.
https://www.forbes.com/sites/chriss...-the-best-and-worst-at-drafting/#6ebb0c575dcd (5th overall)
https://www.profootballfocus.com/news/pro-ranking-all-32-nfl-teams-five-year-success-by-draft-class (1st overall)
https://nypost.com/2017/04/22/studying-5-years-of-nfl-drafts-to-find-best-worst-teams-at-picking/ (3rd overall)
Good luck making a convincing argument that the 2011-13 teams were playoff teams. Go back and look at those rosters. I know it's easier to dislike a guy if you won't give him credit for overdelivering with bad teams, but those .500 teams had .500 talent.
The scheme argument I always counter by pointing out that his offenses have typically been in the top ten, if not top 5 in the league in terms of production per series, which is how you ought to look at the effectiveness of an offense. I don't understand how it can simultaneously be among the most effective and still be a laughing joke, but I'm sure this time somebody will get to the bottom of that for me.