Bradford > Ryan.
Agree with the rest though, Stafford is the best QB prospect in quite a while so to say since Ryan is just weird because if you make it to Ryan you have several years before you get anyone close to Stafford.
As for Clausen, he has thrown a few good passes but is in a horrible situation, which is kind of ironic because most thought he was actually in the best situation of the first 3 QBs this season, for whatever reason, most likely the lame duck coach, the team has given up, the blocking has been pathetic in both run and pass all year, the receivers have mailed it in since day dot, the defense is giving up leads and has been pretty ordinary as well.
I liked Clausen as much as the other two prospects, which was more a case of three flawed prospects that I didn't fell good about than any statement for Clausen being good, but he has been in the worst situation out of those 3 and has looked the worst as a result.
I have seen a few good NFL caliber throws in a few games but his deep ball has been shaky and his mechanics seem to be worse than his past couple of years at ND, mostly though he looks panicky back there, he hasn't had a lot of time in general, but he looks rushed even when the line does give him that rare time.