It all goes back to our most recent Great Debates topic (http://www.fantasyfootballcafe.com/foru ... .php?f=106
) with taking risks.
As I tried to convey in my arguement, taking risks is a key part of winning in fantasy football, as long as you have solid depth.
I would have no problem drafting Marshall late in the second round (where he's going more and more lately), as long as I can grab Steven Jackson later in the draft. I'd also commit fifth and sixth round selections to building solid depth at my RB position -- going after Suggs, QGriffin, etc. At that point, you ride Marshall as much as possible -- but are more than stocked to fill in for him if/when he goes down.
Saying outright that you won't draft Marshall is a bad mistake if you truly want to win your league. As far as I'm concerned, no player is undraftable if you can get him at the right value point and can surround him with quality depth.
For example, I'm really down on Vick's chances this year, but if he falls far enough, I'll snag him and either trade him or ride him when I can -- while still getting solid depth around him.