Just off the top of my head to name a few Couch, Green, Manziel, Richardson, Quinn...the list of failed 1st round picks is long enough to preclude putting 2nd rounder Corbett (ahem) 'up there' as one of the worst
They do bring that up in the article:
"On the
website profootballreference.com, there’s a stat called Career Approximate Value. It assigns a single number to the general value of a player’s career. Since 1999, among players drafted by the Browns among the top 50 picks, only four have a CAV of 5 or lower. Here are those scores.
5, Johnny Manziel, QB, 2014 draft, No. 22
4, Justin Gilbert, CB, 2014 draft, No. 8
3, Brian Robiskie, WR, 2009 draft, No. 36
2, Brady Quinn, QB, 2007 draft, No. 22
1, Austin Corbett, OL, 2018 draft, No. 33"