So looking through the recent episodes wikipedia pages. I think I pinpointed one of The Simpsons biggest issues.
Too many guest appearances.
Like the show revolves around them now. Hell they don't even make promotional images for them just a picture of what the main cameo will look like.
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Brawl is like ZSS' breasts. Well rounded for casual players.
http://i53.tinypic.com/28sxzzr.jpg