RG3's footwork and throwing motion are much improved over where they were even during his record senior season. If injuries were a non-factor, I'd probably take RG3 #1 overall if the draft was redone today and I had the top pick for the Seahawks. I think Wilson is very good with a real shot at being HoF caliber, so that's no slight on him. Luck has looked better than his stats but I'd still put him 3rd in this class, for now.
The big difference between RG3 and guys like Newton and Vick is that RG3 is much much more intelligent than either of them. He makes good use of that intelligence too, and generally has smart placement of the football. He's only thrown 3 interceptions this year, and this after throwing very few interceptions his last year at Baylor. I think Luck/Wilson/RG3 will all be star QBs, but RG3 is the most likely to be a superstar QB based on what I've seen so far this season, if injuries don't stop him anyway.