Wonderlic is a waste. Ryan Fitzpatrick scored like a billion and he couldn't play dead in a western.
You got one example. Here's a much better representation/sample size....
Eli Manning, scored 39, 2 Super Bowl wins, 2 SB appearances
Aaron Rodgers, 35, 1 win, 1 appearance
Tom Brady, 33, 5 wins, 7 appearances
Steve Young, 33, 1 win, 1 appearance
John Elway, 29, 2 wins, 5 appearances
Peyton Manning, 2 wins, 4 appearances
Drew Brees, 28, 1 win, 1 appearance
Russell Wilson, 28, 1 win, 2 appearances
Joe Flacco, 27, 1 win, 1 appearance
Ben Roethlisberger, 2 wins, 2 appearances
So if we assume that 25 and higher is a good score, which it is, and set that as the cutoff point, that's a pretty good list. It breaks down like this....
-10 of the best Super Bowl winning QBs the last 30 years
-average score 30.6
-17 Super Bowl wins, 27 Super Bowl appearances
I'm not saying the wunderlich is 100% predictive, it's far from it, as every thing/tool GMs use to assess and evaluate qb prospects are. However, it's far from useless as it measures a player's ability to quickly process information and make decisions from it.
Not the end all be all, but certainly one of many assessments to be used in putting together a complete player evaluation.