South Park has always been a blend of comedy and satire, but this season the emphasis has been heavily on dark satire while tackling very controversial subjects in a way that only this show can. Obviously there is nothing funny about school shootings or child abuse cover ups, but South Park satirizes our reactions to them and gets laughs out of the absurdity.
The ironic #cancelsouthpark hashtag implies they are going to be pushing the boundaries throughout this season even by their own standards. The show has changed from what it used to be. If you miss the random zaniness of the very early seasons you won't like it, if you appreciate the show's unique ability to skewer our culture then you will enjoy.