It's wild how awful Tebow was, actually. Guy completed 47% of his passes for his career in the NFL. That's bananas.
When fans don't like a mobile QB or they decide someone is a bad QB who the team has to win in spite of, they'll often name-drop Tebow as a comparison to slander the guy. But in the modern passing-friendly era of the NFL the last 2 or 3 decades, it's kind of hard to find QBs who compare to his level of worthlessness as a passer. A career completion percentage below 50 is next-level crazy.
As a thought exercise, if you randomly think of guys off the top of your head who you remember being lousy passers in the last couple decades, and you look up their stats, you might be surprised how hard it is to find a guy who completed 40-something percent of his passes. Like, you'll think, "Oh, you know who couldn't throw at all? Vince Young." But then you'll look it up and find he actually completed close to 60%. Heck, even JaMarcus Russell cracked 50%. I thought about the miserable post-Aikman years we had and looked up a bunch of those guys, and almost all of them cracked 50% completion percentage in their careers. Stoerner, Wright, Hutchinson, Henson -- all of 'em cracked 50% at least. Ryan Leaf was the only one from that dark era of ours whose career completion percentage was down in the 40's.