There's only a handful of Harmon episodes I can say I dislike. The episode with Troy's grandmother, the episode with those teenagers that ended up with Jeff and Britta going 'DUUUHHHHH' for hours, the episode where Pierce dates that Asian woman who turns out to be a competitor to Hawthrone wipes. 81/84 is a pretty damn good ratio, of course. Also I might add First Chang Dynasty just because of how ridiculous it is but it's hard not to watch it because it's the culmination of major storylines.
There are a few episodes in season 4 I thought were decent but I don't have any reason to watch it again just because there's so much entertainment out there and no reason to spend my time on stuff that doesn't stand out as unique.