Keenum was on Fisher. Not being able to run the ball is on Fisher and Snead. And the defense lapsing in the 4th quarter? On Fisher, Williams and Snead.
You forgot Boras, and to some degree, Boudreau. In fact, I don't put much of that on Snead at all, he got Fisher the players he wanted, and his defensive picks have looked great (which, coincides with the unit that has generally played will this season, the Saints game being the exception rather than the rule). On the other hand, Boras is not only the offensive coordinator, but the running coordinator - the run game is HIS design. And I suspect he's the one who decides on the blocking schemes, which clearly are not working with our personnel. Boudreau, meanwhile, seems to have lost his touch. Maybe it's because Boras is asking him to coach his unit in ways they are not suited for, I don't know. But he's got to take at least a little bit of the responsibility.
That being said, your view that Fisher is the common denominator is right on the mark.
Same boring offense? Really when was the last year the Rams threw the ball 40 times a game?
Throwing 40 times a game in a Mike Martz offense is exciting, because it means you are completing lots of passes, moving the ball, racking up yards, and scoring lots of points.
Throwing 40 times a game on Fisherball team means your running game is pathetic, you are behind on the scoreboard, and you are both ineffective and desperate.
I'll leave it to you to decide which one of those is exciting in your view. I know the latter most definitely is not in mine. And I'm going to go out on a metaphorical limb and guess that I'm not alone.