New Browns fan here... I graduated from Texas A&M and decided to check in on how Browns fans feel about JFF. Reading the posts, I felt I could give you some insight into him from someone who followed him since High School.
The kid is just different, he is a Texas HS legend because he put on a show every night... 75 total TDs his sr year which is a state record (think about that for a second, he was scoring 6-8 TDs a game, every game! But he was a 3 star recruit b/c everyone said he was too small and his game wouldn't fly in D1 football. Wrong. He leads the SEC in Rushing as a QB and breaks the all time SEC passing yards in a season his RS Freshman year. Then everyone said he couldn't do it again now that SEC defenses know how to stop him... Wrong again. Led the SEC in total yards, TDs, and passing yards again in year 2. Now people are saying he can't win in the NFL... All his life people have been doubting him and he just keeps proving them wrong. Just give him time and he will put on a show for you.
Evans benefitted just as much from johnny as johnny did from evans. evans is a horrible route runner btw.
JFF doesn't run as much anymore... He more so uses his legs to buy time so he can find an open man. That means he will get hit less than a usual pocket passing QB. People don't seem to understand this. Hoyer is more likely to get hurt than JFF... Like last season. Also, Johnny plays through pain... Most Aggies think he had a broken finger and separated shoulder for the last few games of the season. He is not a baby and he is EXTREMELY competitive at an elite level. Him falling in the draft was the best thing for him b/c it will fuel him. His teammates loved him (ESPN made stuff up about locker room jealousy), he works very hard to get better (he plays hard too), and he is actually a pretty nice guy. His problem was a lack of maturity on how to stay out of the spotlight but he is improving there as well. Don't believe whatever ESPN tells you... They use him for ratings. The E in ESPN stands for entertainment.
Will he be great? One can't know for sure but I would take a chance on him being great before any other QB being great in the last few drafts outside of Luck. He will will the Browns to victories or spend the whole offseason improving if he doesn't play well. Sit back and enjoy b/c every snap is a chance to seem something amazing.