2017: None
2016: Cyrus Jones
2015: Jordan Richards
2014: Jimmy G
2013: Jamie Collins, Aaron Dobson
2012: Tavon Wilson
2011: Ras-I Dowling, Shane Vereen
2010: Gronk, Jermaine Cunningham, Brandon Spikes
I'm sure there are teams that have done better (remember, though, that the Pats are usually drafting later in the rounds), but that's not terrible. Spikes had some decent years, Gronk is Gronk, Collins is making a fortune elsewhere and showed some special talent, Dobson had a tremendous rookie year, Jimmy G filled his role as expected and
then some, Wilson (and Darius Butler) had decent careers elsewhere.
Also, the Patriots are never top-heavy with talent, so it's much harder for someone to make a contribution coming out of college.
I'd like to see a team-by-team comparison on the round before falling for the psychoanalysis of the coach.