Int's are not the best way to judge Cb''s. It means they are thrown at more often. The best Cb's disrupt the routes
and force the QB to go to his next option.
Some of the best shutdown corners in the league don't get INTs at all.
I remember Nnamdi Asomugha on the Raiders, the opposing QB would rarely throw his way since he had everyone blanketed. He was one of the best corners in the game but only had like 3 INT's in a season. They literally only threw his way like 3-4 times per game.