I had a chance to preview the "Mac & Dennis: Manhunters" episode, which is one of the two that will be airing tonight (the other being "The Gang Solves the Gas Crisis").
The episode has two concurrent plotlines: 1) that from the title, where Mac and Dennis decide that "a great hunter should go after something that can hunt back...like a man" and thus end up hunting Cricket, the homeless man and 2) Dee and Charlie mistakenly believe that they have developed a taste for human meat and thus go on a cannibalistic quest to find more.
Both storylines brought us the inappropriate humor that we have come to know and love from Sunny - including jokes pertaining to racism (a recurring theme on the series), cannibalism and necrophilia, to name a few.
I enjoyed the Charlie/Dee story line more; while an otherwise funny episode, the one recurring theme that I didn't find all that funny were all of the 'Dennis/Mac acting "gay" jokes'. Watch the episode and tell me if you agree. I find these sort of jokes to be a little played out, and while Sunny generally masters the line between the supremely inappropriate yet still humorous - these jokes rubbed me slightly the wrong way. Perhaps I'm overreacting. At any rate, the Charlie/Dee storyline was more original anyway.
One final observation I have made is that as the seasons have progressed, the individual episode themes have been edging towards the increasingly preposterous. We started with things like underage drinking and gun use, progressed to crack addiction and serial killing, and now...have landed on cannibalism. I still find the show and humor to be quite good, but you can't argue that the scenarios have continued to increasingly diverge from reality.
All in all, I think the show is back in its prime form (I thought the third season had a few dud episodes along with some great ones). However, as the seasons continue to have more and more episodes, we'll see if they can keep it up!