Check out Football Outsiders' assessment of Aqib Talib in the following link:
Comparing their bottom-line assessment against Darrelle Revis and Devin McCourty in adjusted charting stats for 2011:
Adjusted success % (% of unsuccessful offensive plays against):
Revis - 62%, ranked 11
McCourty - 46%, ranked 65
Talib - 64%, ranked 6
Revis - 5.5, ranked 8
McCourty - 10.6, ranked 78
Talib - 5.5, ranked 9
Revis is better than Talib on pass defense, Talib is better than Revis on run defense. But overall Talib is in pretty select company statistically. McCourty, our supposed #1 CB in 2011, had an awful year last year and the Pats still made it to the SuperBowl. Amazing!
One other interesting stat. Revis was ranked 1st among all NFL CB's in 2009 for both adjusted yards/play and adjusted success rate. Talib was ranked 31st and 53rd respectively. Talib is ascending in ranking, Revis is going the other way.
I don't know how the personal side of Talib's life is going to work out longer-term, and I really hope and pray it improves markedly, but this is a very talented corner. BB knows how to trade, I have to say.