He can hit, but can he cover? He's stiff in the hips and his change of direction skills are not that great.
Leach even said that Deonne would have to work on his coverage skills. Another report on him is that he goes for the big hit and doesn't always wrap up. What the Cards got was a younger Adrian Wilson and the concern is that guys like DB the db have been legislated out of the league. But given that, surely Keim and Arians have considered the new rules and wouldn't have taken Deonne if they thought that would be a major problem.
No they have not been taken out of the league that issue is being way over blown. The last two teams to win the Super Bowl had Kam Chancelor and Bernard Pollard playing SS. Two guys who WR fear coming across the middle this is still the NFL.