I don't think he's as bad as he looked like the first two games. I said earlier that I actually don't think the Colorado game was as bad as some, just from the standpoint that I can't believe that he'd continue to drop snaps like that and the handoff fumble was Grant's fault.
But two of the interceptions against Minnesota were just terrible. You can't have a three-year starter throwing balls like that. I don't see how that kind of decision-making gets fixed at this point.
HH's tipped ball INT was still somewhat his fault but I don't put those kind of things in the same category (although his low delivery will likely continue to be problematic). And HH did hit a N. ILL defender in the hands but it was dropped, iirc.
So I'm not saying HH is leaps and bounds greater. But I just don't have any hope that Sims will be significantly better, based on his history and what we've seen so far.