There is a line to be drawn where an NFL starting QB goes from acceptable to not good enough. Right now, I'd call it the Dalton/Bradford line, because Andy Dalton is just barely on the good side of it and Sam Bradford is maybe the 1st quarterback on the bad side of it.
I know Bradford hasn't had weapons, but he just lacks the body language, subtleties, and intangibles of a top shelf QB. And truth be told, he never had them even at Oklahoma where he was damn good. I think as a pure system/timing/chemistry QB at a place that runs spread like New England, he could be good, but as a prototypical QB that is asked to improvise, I think he'll always be mediocre.
I am eternally grateful that the Rams drafted Bradford. If they hadn't, RG3 might be a Ram right now. And even if the alternate universe Rams hadn't gotten Bradford or RG3, they'd probably be bad enough this season to have a shot at Teddy Bridgewater or Tahj Boyd. Basically, Bradford is keeping his team in the bubble of mediocrity- too good to rebuild, to but not good enough to seriously contend for a championship. As a Seahawks fan who lived through the 1990's, I can tell you that this isn't a place you want to be.
On the plus side, I think Tavon Austin is legit, and Fisher is a very good coach in game. I thought the Rams draft was probably the best in the NFC West this year, at least in terms of starters added.