here is the deal.. with the recent changes to WR, allowing them to use agility-based route running where they juke and head fake, you need a very high vision/super vision to not get beat. if a CB fakes you just once and you don't have help over the top, count 6.
here is an example:
http://goallineblitz.com/game/replay.pl?game_id=310127&pbp_id=4901968notice the stutter step that the CB bites on prior to the completion.