It's lacking in top talent, but full of depth. At this point I'd say draft 2013 is about the right comparison, but it could easily end up worse. Honestly, a little early to fully judge draft 2013. Lots of guys don't blossom until years 3 or 4, which is precisely what would happen with the majority of the 2015 crop. See Tyrod Taylor, who was a 6th rounder in 2011 but never even got a chance at anything until 2015 with the Bills.
Every draft has developmental talent. Most drafts have 10-15 QB's taken, and last year was a bit of an aberration with only 7. While there's certainly nothing like J Winston this year, and nothing even close to Mariota. If you're willing to take a chance and actually develop guys a bit, though, there's a lot of guys to be interested in. Goff, Lynch, Kiel, Hackenberg, Wentz, and possibly Trevone Boykin, Cardale Jones, and Jacoby Brissett could all go in the first three to four rounds. They all could potentially develop into competent starters or good backups ( 2015 Cowboys know how valuable a good backup is), but each have issues that will likely require a year or two of old-school sit-and-learn development before they're ready to take on NFL defenses(cowboy fans just love this scenario.)
That said, the 2017 QB class... wow franchise talent ... Deshaun Watson, Patrick Mahomes, Brad Kaaya, and Malik Zaire... remember these names.