I always have a problem with lists like this because I'm of the camp that young QB's shouldn't be forced to play early on bad teams unless they are absolutely ready, and a bunch of the guys on this list fit that description.
Darnold, for example, is saddled with one of the worst coaches and supporting casts in NFL history, so it's hard to judge him too harshly. He's undoubtedly regressed and definitely isn't playing well enough but what QB is going to play well on that ass-fisting of a team? I hope he's Ryan Tannehill Part II but who knows. The only thing I know is that it's not going to happen for him as a Jet.
Haskins has the arm talent IMO but everything that is coming out news-wise from WFT indicates he's a clusterf*** in the locker room. He would have been perfect in a situation similar to what Jordan Love is in in GB, where you have a long time to gradually learn under a brilliant mind at the position.
Trubisky was overdrafted, thrown in too early in an effort to make a splash for the Bears front office and failed miserably. I want to say that I can't imagine him ever starting again but that would be a lie due to some of the crap you see under center across the league for a myriad of reasons.
Jones isn't horrible but man oh man does he turn the ball over a lot. The Giants' defense isn't the worst in the league but they're not good enough to handle being put in a short field so often. Much like Darnold, he'll be scapegoated if his team gets the #1 pick. I think he could at least put together an Andy Dalton-like career somewhere though.