There's 6 rookie starting QBs
Andrew Luck is the best QB prospect to come out in the last decade. Not a fair comparison.
Shanahan has done a tremendous job of putting RG3 into a system where he is an absolute perfect fit. Plus, he has better weapons around him and a better coaching staff. His pass attempts have been limited because they are utilizing the option to allow their receiving core to get open and let RG3 gradually develop. I am not saying Weeden is better than RG3 right now, because he's not, but realize RG3 is thriving because hes in a system tailored around him. This is the reason I want Kyle Shanahan as our next head coach.
I would take Weeden over Tannehill, hands down. They have the exact same QBR and Tannehill was picked 8th, not 22nd. Plus, Browns rank 13th in pass attempts per game while Miami ranks 26th. Weeden has 13 TD to 15 INT, which is better than Tannehill's 7 TD to 12 INT. Given that Miami has a better coaching staff and a actual veteran leadership in the offensive skill players, Tannehill would be expected to have better stats than Weeden... Which he doesn't.
Russel Wilson has the benefit of playing from ahead. He may be better than Weeden, but he also has a WAY better coach, elite defense, and, again, veteran leadership at offensive skill positions.
Nick Foles doesn't hold a candle to Weeden.
Cleveland has a questionable head coach who tells Weeden to do one thing; they have an OC who tells Weeden to do something different. Ever see Weeden make reads at the line of scrimmage and call audibles? No. Is it because he's inept? No. Shurmer won't let Weeden change the play at the line of scrimmage. Forget Cribbs... Weeden is caged. We have had a new starting quarterback every year since 99, all of which have not panned out. Is it more likely we missed on over 10 prospects, or more likely that our quarterback development/system isn't effective? Aside Anderson in his pro-bowl season, Weeden looks better than every other quarterback we've had. Weeden is still in the system that led our other quarterbacks to fail. He is a rookie surrounded by rookies. What do you honestly expect?