There are plenty of top 5 players that have a huge negative to them. Randy Moss being one of them.
As great as Sanders was in coverage, he simply made it easy to criticize him due to not being an all-around CB. Sanders got by on a lot of natural talent and talk, same goes for Moss. Sanders may arguably be the best cover corner, but when it comes to all-around corners, there were better ones.
I bring up Randy Moss because he's a great comparison, just on the opposite side of the ball. He may arguably be the fastest and most talented WR to ever enter the league - but he was never an all-around great WR. Never perfected his route running,
What players like Moss and Sanders did well, they were the best at. But in other areas, they left a lot to be desired and it can't be ignored. You can probably make a lowlight tape alongside his highlights of him acting like he was going to make a tackle just to allow the guy run by him.