This has been a problem for some time for the Dolphin receivers. They don't run great routes, period. And, they don't break open. When you look at other successful offenses, there will always be 5-6 times where a WR will be wide open downfield during a game. It may not be on a bomb but it will be on a deep in or slant. Part of this is the lack of speed and quickness on the Dolphins Offense. Chambers has decent speed, but he's not a guy who can separate on deep passes like Moss and he doesn't have the quick moves of a Harrison. Part of the problem also is route running and the final piece is the route running scheme and game plan.
Let's face it, Dave W is not a genius. Even in the football sense.