What you guys are missing (and I had to explain to another guy on another forum recently) is that the style RGIII played in Washington his first year is the only style that he has shown he can play successfully in the NFL. Unfortunately for him, two things happened:
1. Defenses adapted to this play style.
2. His injury.
I predicted on numerous occasions that BOTH of these things would happen. I pointed out on NUMEROUS occasions that Shanahan installed a gimmicky offense full of read options, designed QB runs, and other tomfoolery. Of course, all I got back was things like "RGIII is better than Luck!" and foolishness like "He isn't running designed run plays or read options! He is a pocket passer! You don't watch his games!" The last part was especially funny because I literally had just watched one of his games and like 3/4ths of his plays were exactly what I said and the times he remained in the pocket, he showed terrible footwork and presence.
Guess what? I was 100% right and proven so the last 3 years, just like I was proven right about Kevin Kolb and Michael Vick, two other QBs I was ridiculed for criticizing when I said the Eagles ripped the Cards off for trading for an unproven and mediocre QB (Kolb) and said Vick was not an elite QB. And to be clear, my original argument wasn't the fact that the Redskins drafted RGIII, but the fact that the Rams ripped them off. Again, Redskins fans told me I was nuts and guess who was right?
RGIII has had AMPLE time to become a pocket passer. He has shown he has zero pocket presence and while his offensive line might not be great, Luck has been hit FAR more and keeps lighting it up. Shanahan was the ONLY reason RGIII had ANY success at all in the NFL. Most other teams would've forced him into a pocket passer role and as we've seen, he would likely not do well.
Lastly, the Colts did consider taking him but were exposed to his attitude issues and that sunk any slim chance he had of going #1 overall.