people don't hate the new episodes as much as it sounds. but the best of this season aren't nearly as good as the best of the old seasons.
i think everyone is terrified of it becoming like the simpsons and are trying to prevent this with their armchair critiques. also, everyone wanted too much because the last season of south park was lackluster and they need their fix of new, brilliant animated comedies.
the writers are definitely still exploring and taking risks -- seeing what people do and don't want from the new ones -- it's just that some new things aren't as "witty" as they've been in the past. some new efforts have been hilarious (i liked the teacher episode) and some have relied too heavily on certain elements, like pop culture and "over-the-top" jokes (i don't know why this has become a trend in shows like this), and haven't been.
i'm looking forward to see what they try in the last five, but i'm convinced the next season will be substantially better.