I think part of the fun of watching sports is debating the rise of new stars and they are going to perform. The way to measure them is by comparisons against existing records.
I admire Brady's record because he was overlooked in the draft and came from nowhere (in a sense) to make all the scouts and prognosticators wonder how they missed him.
Tebow has a bit more pedigree with the Heisman. But, "they" all say he doesn't have what it takes. That makes me his fan right from the start. I love the underdogs and the guys who fly under the radar until their performance is impossible to ignore.
Back in the 80's the 49ers used their first round pick to claim a receiver from a division 1AA school; Mississippi Valley State University who didn't even get a single scholarship offer from a Division 1A school. We all know how that went.
Rice won Super Bowls. Tebow has won a few regular season games, with a lot of help frol an awesome defense and a great kicker. Peiple wanting to make any long term predictions about Tebow now aren’t really interested in football, just the political implications of his few impreaaive wins.
There are a lot of reasons why college success doesn't always translate to success at the NFL level, and vice versa. Tom Brady is an interesting case because much of his college career at Michigan was spent playing with two other QBs who were also good NFL prospects: Brian Griese (son of former Miami Dolphins QB Bob Griese) and Drew Henson (who also played baseball and was drafted by the New York Yankees).