All joking aside, I follow the draft every year and it really is a tradition for fans to boo certain pics ruthlessly. Go to youtube and lookup "nfl draft boos" and you'll see. It's nuts. I don't think they were really singly out Tebow as much as they were the Broncos because the Broncos really went against the grain by drafting him.
Hopefully he'll prove all the critics wrong (I don't think he's an NFL style qb either) and light up the league. He's a fine Christian man and could be a great example to countless people.