Are you daring me to bring out my Patriots drafting WR analysis!?!?! I have copyrighted it, just so you're aware.
But anyway, the Patriots have only succeeded in finding 4 WRs over the last 22 years. You have to add Givens and Mitchell.
But they've also used barely any premium picks (top 3 rounds). 7 picks in 22 years is a league low.
Of their 16 picks (I'm counting Braxton Berrios as a miss but I'm not counting Matthew Slater at all as a pick or a miss), several of them have been 7th rounders, like Edelman, but also like Ebert, Gallon, Lucien, etc.
In other words, we do have a bad 25% success rate (compare to the Steelers 33% rate), but we almost never use premium picks of the position, and when we do it's mostly disastrous. For one Branch, we have multiple Dobson, Tate, Harry, Chad Jacksons.
That being said, you look at the Steelers and they hit 3 of 8 premium picks in the last 8 years. (Yes, the Steelers have drafted more WRs with premium picks in the last 8 years than Bill has drafted in the last 22 years). They succeeded with Dionte Johnson, JuJu Smith-Schuster, and Claypool, but failed with the likes of Wheaton, Archer, Bryant, Washington, Coates.
Patriots are bad at evaluating, but they also don't expend much to actually find a WR, even if it's just dumb luck (i.e. the way the Steelers do it).