Why is Joe Mixon under appreciated?

[grampahol]

You have to consider Mixon has never had a great offensive line in front of him and in fact the majority of his time with the Bengals they've been barrel scraping slugs.. This is the first season they've been half decent. He absolutely rarely fumbles and catches most everything thrown to him. At the least he's no Cory Dillon going to a superbowl winning team telling the world, "They don't even want to win."