I love Greene. I want him really bad because I think there is a really good chance he has a great year. That's the truth, so I don't want to give the impression I'm dogging him.
My issue is not his talent or his upside or his opportunity. My only issue is the draft position (which started this whole thing). In the early 2nd, you have a lot of rock solid names you can pick, especially at WR. The bust rate for RBs is high enough without adding any additional question marks.
Had you asked me 3 months ago, I would have put Greene up with Mathews. The problem is Mathews situation has remained very clear. Greene's prominence from the COACH'S view has never really been confirmed. We've gone round and round with the same scenario with Jamaal Charles in another thread. One thing I've learned over the years is that a player's ability often translates very little into the coach actually calling his name. (See DFoster/DWill history)
So, early in the second round is not where I want to "assume" something is going to happen the way I think it will. You can live with a top 10 (hopefully top 5) WR pick there, which is a much more reliable selection, historically. You can win with that. You cannot win if Shonn Greene ends up being the 25th ranked fantasy RB in the league. And while I don't think that will happen, I can easily see a scenario that it will.
If you are that confident he will get the touches we're talking about, I'm not going to mock you. I'm just saying I don't have enough confidence to take him over a top flight WR. I prefer to take my upside, unproven RBs in the 3rd, 4th, and 5th rounds. It's just a much cheaper selection.