Tebow has shown the ability to hit the short pass, the medium pass and the deep pass. What Tebow has not yet shown is the ability to do that consistently. This should come as a surprise to nobody, however. QBs generally adjust to the league, as opposed to coming out as finished products.
John Elway was at 47.5% his first year
Manning was at 56.7% as a rookie. His last 9 years have all been at 66% +
Drew Brees is 10% higher this season than in his first full year.
Michael Vick's first 8 games (2 starts) had him at 44.2%. He was 62.6% last season
Aaron Rodgers, another QB who's throwing was questioned, is 6% higher this season than in his first full year, and that's after sitting for 3 years
Brady was a bit of an exception, throwing for 63.9% in his first 'full' season. He wouldn't match that again for 6 years.
As I've said before, I don't really care about Tebow, and I don't know if he'll be able to stay in the league as a starting QB. I do find, however, that people's bashing of Tebow has tended to expose prejudices on their part.