Like personality tests. It's not shocking that the daughter of the guy who created it has, in addition to criticizing the Wonderlic, created her own company that sells cognitive and personality assessments.

Conclusions from a 2009 study:

1) NFL performance on the football field was only found to have a statistically significant correlation with Wonderlic scores among two positions: Tight end and defensive back. Correlations were statistically negligible across all other positions. (Yes, even QB.) In other words, with the exception of TEs and DBs, a player’s Wonderlic score (high or low) gave no predictable projection for their eventual productivity as an NFL player. It was worthless.

2)Tight ends and defensive backs showed a negative correlation.

You read that right. Among these two positions (one of which Claiborne plays) a bad score was a more promising indicator of future NFL production than a good one.

“When we started the study, we proposed that Wonderlic testing would be most important (for projecting NFL productivity) at the quarterback and offensive line positions,” Hoffman said. “We did find that QBs and O-lineman indeed had the highest average scores as positional groupings, but differences in these scores had no effect on eventual production.”

http://www.austinchronicle.com/daily/sports/2012-04-05/the-nfl-beat-wonderlickin-bad/