RG3? Led his team to a mediocre 9-7 record, backed into the playoffs, and lost his first playoff game. Struggled with injuries, missed 1 full game and was behind in the Baltimore game, which Kirk Cousins was able to salvage. Then permanently destroyed his knee in his first-ever playoff loss. Not impressive when compared with other great rookies.
Eric Dickerson, Lawrence Taylor, Barry Sanders, Jim Brown and Dan Marino were all better rookies with greater impact on the NFL than RG3.
He's not even the best rookie QB of all time. That would be Dan Marino.
Dan Marino only played 9 games his rookie season, made the Pro Bowl, set like 6 records, threw for 2200 yards and 20 TDs, and lit up the NFL. He only lost 2 games as a rookie, took his team to 12-4 and won the AFC East. I remember his rookie season very well because I also remember watching the Seahawks beat him at Miami in the playoffs. He still put up a better fight than RG3, throwing for 2 TDs and keeping every Seattle fan on the edge of their seats. Thank god for another rookie phenom, Curt Warner!
Marino's first full season he threw for 5100 yards, 48 TDs and took his team to the SuperBowl. He didn't throw for less than 4000 yards in any of his first 3 full seasons. Watching him play was like seeing a grown man play football against a bunch of kids. He just destroyed defenses. RG3 has never played at that level, not even in college.
Oh, and Russell Wilson was great, but still not as great as Marino. Sorry. But I think he'll be better over the long haul and will actually win a SuperBowl.