He wasn't great by any stretch but I don't see how anybody can fault him for the fumble by Becht which very possibly cost us points, and basically gave the Rams a lifeline back into the game. It actually looks to me like someone ran the wrong route because Becht, Boldin and Fitz were all in the same general area. Boldin was deeper than Becht right behind him, and Fitz was deeper off to the left of Becht which is how he was able to knock the recovering guy out of bounds saving a TD.
The play was a rollout right which seems odd, and I suspect this was the one call a game we seem to do for Becht that's a total surprise when we really want a completion. It was 2nd and 11 from the Ram 45, I suspect Whiz was figuring get 6-8 yards to make 3rd down manageable. I actually wonder watching the replay several times on NFL.com if the reason Boldin was so mad is that someone(maybe him) ran the wrong route? 3 guys reacted to Becht and I can guarantee you that they weren't there out of fear of Becht they were there because Fitz and Boldin were in the same general area and Matt was rolling out.
But if Becht just holds on to the damn ball at that point in the game it's 21-6 with 12 minutes left. Even if we don't get into FG range on the 3rd down, we're punting with another chance to pin them inside the 20 as Graham has done so well all year.
But Becht fumbles and they start their drive on our 44 yard line. That play is what actually changed the game, not Leinart's performance. If Becht doesn't fumble this game very likely is not remotely close the 4th quarter.