It's Always Sunny in Philadelphia
basically it's about 3 guys and a sister of one of the guys who run a bar and are assholes to each other.. danny devito plays the father of the brother and sister... they can get away with saying 'shit' a lot on FX so they kind of over use it in the show.. but it's still a really good HILARIOUS show... (imdb)
I thought this show immediately went downward with the introduction of DeVito as a main character. The first season was so, so funny with just the original cast of four. The new episodes are kinda funny, but DeVito just brings a weird vibe and a brand of humor that just doesn't mesh well.
im inclined to agree, but i've seen some great episodes with devito now too.