A sampling of QB draft classes since the turn of the century (top 4 rounds only):
2002: David Carr, Joey Harrington, Patrick Ramsey, Josh McCown, David Garrard
2006: Vince Young, Matt Leinart, Jay Cutler, Kellen Clemens, Tarvaris Jackson, Charlie Whitehurst, Brodie Croyle
2007: JaMarcus Russell, Brady Quinn, Kevin Kolb, John Beck, Drew Stanton, Trent Edwards
2010: Sam Bradford, Tim Tebow, Jimmy Clausen, Mike Kafka
2013: EJ Manuel, Geno Smith, Mike Glennon, Matt Barkley, Ryan Nassib, Tyler Wilson, Landry Jones
2015: Jameis Winston, Marcus Mariota, Garrett Grayson, Sean Mannion, Bryce Petty
These classes managed to find one franchise QB (usually with the #1 overall pick), but were otherwise pretty bad as well.
2003: Carson Palmer*, Byron Leftwich, Kyle Boller, Rex Grossman, Dave Ragone, Chris Simms, Seneca Wallace
2008: Matt Ryan*, Joe Flacco, Brian Brohm, Chad Henne, Kevin O’Connell
2009: Matt Stafford*, Mark Sanchez, Josh Freeman, Pat White, Stephen McGee
2014: Blake Bortles, Johnny Manziel, Teddy Bridgewater, Derek Carr*, Jimmy Garoppolo, Logan Thomas
2019: Kyler Murray*, Daniel Jones, Dwayne Haskins, Drew Lock, Will Grier, Ryan Finley, Jarrett Stidham
Sobering. Sometimes, there’s just not a QB worth drafting.