Here are my thoughts on the players and how I rank them as of 10-20-17, and yes I have seen them all play.
The first comment, this is a good QB year, but not quite as good as the media is claiming! There might only be one " Franchise QB " of the bunch.
Rosen. Rosen comes from an athletic family sort of surprised me a bit because he looks like a lanky type of kid. But he's somewhat athletic. Rosen is young and can add a bit to his frame. His accuracy, decision making, and arm are all very good, and he has brought his team back from behind. The concern with Rosen is he could be a " Hollywood type " , and there is stuff out there his teammates really don't like him a lot. But as a QB prospect, he's the best of the bunch in October 2017...I think.
Rudolph. Rudolph has been under the radar, but its hard to ignore his TD to interception ratio ( 19-4 ), size ( 6'5" 230 ), and completion percentage. ( 66.7% ). He's also a threat to run and score with 6 ground TDs. He does have a top talent at WR, but I say so what. The guy looks like a winner to me and could skyrocket up the mock draft charts once someone tells Mel Kiper how good he really is.
Jackson. Jackson is super athletic. He can run like the wind and jump. But what type of quarterback is he? His completion percentage is a little low at 60.2% ( 56.9% for college career ) and he was shut down vs. the Clemson defense. The good news is he takes care of the football and doesn't have a lot of interceptions. However, I do not think he will fare well as a passer vs. an NFL Defense. His skinny frame scares me a bit to the point where if he doesn't alter his playing style, he's going to get hurt. But he could fit with a running based team with a good defense ( because he doesn't turn it over often ) and that scares me a bit because the Steelers are one of those teams.
Darnold. Darnold has not impressed me in two viewings. This guy thinks he's Brett Farve, except he doesn't have that special type of arm to pull off what Favre did. He's hot-headed or if you prefer very competitive, but his emotions get the best of him too often. While the tools are there to be great, I saw some stuff I did not like and his accuracy is just okay. Could be a real boom or bust type of pick. Right now I do not think he's worth trading up to obtain and think he should stay in school if possible unless he has a strong close for the year. Fair or not, beware of hyped USC QB's like Sanchez and Leinart. While I did not think either was good NFL prospects or QB's the hype attached to them wasn't a good thing for their development.
Allen. Allen is hard to evaluate because he doesn't have a good OL or skill players to work with. The accuracy is not there yet, but the arm and toughness are top notch. He might have the best upside of the bunch, but he'll need a year or two to hit his stride. Similar in some ways to Carson Wentz who's finally playing like a top 5 NFL pick. Another boom or bust type of pick, but there's something about this guy that makes me think he has a chance to be special.
Stidham. Only a sophomore, his accuracy, and TD to Interception ratio in the SEC are most impressive! In 17 games played the young Stidham has 20 TD's and 4 Int's, with a career 66.8 competition percentage. He doesn't throw it a lot though, which could be coaching. Is he just a good game manager, or perhaps something more? The arrow here is pointing ^^^