Bottom line? He's a decent player, but that I'd never draft him over someone like Anquan Boldin, Hines Ward, or Torry Holt in a dynasty league. Those guys are among the best at their position. I can't say the same about DD.
Here's where I don't agree with you. In terms of FANTASY football, Davis IS one of the best at his position. I don't feel like looking up all the numbers again, but since taking over as a starter Davis ranked in the Top 6 or 7 in PPG at RB. even in total fantasy points over the past 3 years he ranked 8th.In that same timeframe, Boldin ranked 11th the past 3 years in total fantasy points by WR and Ward ranked 8th. If you feel that those guys are better options, so be it, but IMO that does not make Davis any less of a fantasy producer.