I am a bit of a QB scientist myself, so let me go ahead and just spoil the intrigue over the next few years, as I have done accurately in the last several drafts.
JJ McCarthy is nothing more than a game manager at the next level with a likely 1 or 2 year starting career followed by a longer string as #2, he was nothing more than that in college. Can a pent up 1980's power run offense by a former DC turned HC win with him? Sure, if he has a stacked team around him (see Purdy, Brock). But don't expect him to be able to put the team on his back more than once per season and deliver.
Caleb Williams is the Deshaun Watson of this draft. His bust potential is as high as his boom potential, and he may do both. Williams is elite in almost every physical category and can make a QB guru type coach a career if he gets that dude (see Reid, Andy). He has clear flaws and question marks between the ears, but an elite game planner/play caller will save him from himself. If he doesn't get that, then he could be 5 and out. Sean P
Drake Maye is Colt McCoy with more pro tools. He has that wicked accuracy and decision making but with a better arm. Solid leader, by all accounts a decent dude, and a hard worker. However, unlike Colt, he was not good enough to mask major deficiencies on the rest of his team. If I am drafting him, my main question is how come he didn't carry his team more than he did. I think he starts longer than JJ, but not much longer unless he finds himself in a perfect system. Sean McVay or Sean Payton are probably the best coaches for him.
Jayden Daniels is a guy that I think could have a solid career, but he is going to be minimized at the next level athletically and not able to get away with some of the shit he did at LSU. He is not the next Lamar Jackson.
Bo Nix... lol. A checkdown master with scrambling ability will make a bad team just as bad.
Michael Penix is the guy we could all look back on 5 years from now and wonder why all of the obvious signs that he was going to be great seemed to not register. Put this dude in a downfield passing attack and he could be a three contract guy in the NFL. His decision making, throwing to leverage, and insane downfield accuracy are all better than anyone in the draft. If they try to put him into a more traditional progression based system he will underperform, if they put him behind a bad OL then he will be injury prone, but if he gets a Shanahan/McDaniel/Reid type system then he is going to be a monster.