Yeah maybe, except muffed punts are (more or less) unforced errors. I'd put Brady's pick into double coverage as a largely unforced error. So was overthrowing Gronkowski on that second drive. Alex Smith throwing at the feet of open receivers without being under huge pressure is an unforced error.
And that's what should happen at this point in the season when you get to conference championship games because all the teams are pretty damn good. These conference championship games looked shitty because you had strong offensive teams matched up against strong defensive teams. Strength against strength and weakness against weakness will lead to what looks like sloppy games but in reality are teams struggling against one another.
There's sloppy play that's the result of strength vs. strength, and then there's sloppy play. My sense is what we saw on Sunday was more sloppy play than normal, insofar as I noticed more "oh no" plays that didn't seem to be forced by the other team than usual.