Sean Taylor STRUGGLED in man-to-man coverage? I think you can make your point without the hyperbole. Maybe it wasn't his strong-point, but to say he struggled at it is a little bit crazy. Now, maybe you're basing this on the fact that in the beginning he was apt to bite on a play-fake more often than not, but I don't think that speaks to his man-coverage skills.
There are things Sean Taylor struggled at, this is true. Sean Taylor struggled at choosing the right crowd to hang out with. Sean Taylor struggled at reigning in his emotions at time (e.g. forearm to TO's jaw), and ST struggled at going for the big hit instead of playing the ball sometimes.
But man-to-man coverage? This is a guy who ran down the field step-for-step with Randy Moss in his prime, then out-leapt him for the ball, knocking it away. That doesn't happen if you struggle in man-to-man coverage.
Also, just FYI - safeties are often relied upon to cover WRs down the field - its the basic premise of the cover-2 defense.