When you think about it, teams never throw at Vasher. The only reason he has/makes/misses a lot of tackles is because they usually only throw to his WR on screens or short passes. Vasher has improved as a 1 on 1 corner and with his ball-hawk skills, he'll be one of the best corner's in the game for a while.
As far as Tillman, hes best against bigger, more physical receivers. People hate him because Steve Smith burned him big time. That's not his fault, everyone know's Vasher should be covering the speedy/deep threat WR and that Peanut should cover the physical/possession WR.