Of the more recent years, 2015 was a really bad one, especially the second round. The final 14 picks have played a combined 37 games and 180 minutes in the 7 seasons since that draft, and 15 second-rounders plus one 1st rounder have never made it into an NBA game.
Towns, Booker, Porzingis, Russell plus Turner, Rozier, and Harrell is not a great draft, but it certainly isn't a terrible draft. Also, a lot of decent starters and long time role players (in order of draft position) like WCS, Kaminsky, Lyles, Payne, Oubre, Portis, Nance, Looney, Osman, Holmes, Richardson, Connaughton, and Powell.
2013 is a pretty darn weak draft overall despite producing the current best player in the world (Giannis) and the best big defender in twenty years (Gobert), after them you have McCollum followed by Oladipo, Schroder, and Adams in contention for the next best player (it is actually probably Covington who wasn't drafted). So if you were putting a team together, even with Giannis and Gobert, I'm not sure how many drafts 2013 would actually beat in a game.