The point is nothing sustained. All 3 teams have missed on QBs over and over and turned over HC/GM/FO multiple times. It's almost harder for 3 teams to fail this bad for this long. You would have thought they would have lucked into a franchise QB by now. Even 1 of them.
One of those was primarily due to injury, I personally don't equate it on the same level as missing on a pick. And Sanchez's draft was historically bad, there really wasn't a better pick for the Jets available.
After that though, yeah, nothing but terrible decisions...though too early to tell for Darnold. I think the 00s Jets were overachievers, yet also underrated simply because the Patriots were so great.
But what's the line for a true franchise QB? Tannehill looked good for a while and holds a bunch of Dolphins records, though no playoffs. Pennington managed to make it 4 times, which is more than most QBs of this decade can say.
More importantly, outside of the year the Dolphins took Jake Long, none of these teams had a #1 pick, which is typically where your top franchise QB prospect goes.
Basically, they've been bad, but not bad enough to get the best shot at the most promising talent. At least half of the league is in that same level of mediocrity on a consistent basis.