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This is not really an award that you would ever want to give out, nor an award that any player would want to earn, but it is worth looking at.
Just a note, injuries do not qualify a player for having a disappointing season.
Chris Kemoeatu: Kemoeatu has always been a player with the physical abilities, but lacked in the mental side of the game. He took that to an extreme this year with mental mistake after mental mistake, whether it was missed blocks or dumb penalties.
Kemoeatu eventually lost his starting job because of it.
Rashard Mendenhall: Heading into the final week of the season Mendenhall only has 890 yards and is averaging only 4.0 yards per carry. Granted he is running behind an offensive line that does not give him much room, but at some point you have to create your own yards.
Casey Hampton: The Steelers' rush-defense has not been as stout as usual, and that all starts up front. Hampton has not commanded the same double-teams he has in the past and is part of the reason they are getting beat up front all too often.
Lawrence Timmons: Timmons is coming off of a big contract, but has not lived up to it. He only ranks third on the team in tackles and has only one sack and one interception.
A lot more is expected from a former first-round draft pick with a huge contract. The Steelers needed him to make big plays this year, and he did not make enough of them.
Most Disappointing Player
Lawrence Timmons—it really isn't even close in my opinion. Timmons has not lived up to expectations this season, and the Steelers need more production from their most athletically gifted linebacker.