Love it or hate it, IASIP is extremely consistent. Week to week, season to season, the deliver fast paced comedy. A very dark show about some of the most selfish people in the world (where everyone involved in writing is probably going to hell) is also one of the funniest. Many people will say that's its just yelling, which to some extent is true, but it's clever yelling.
Give the show a few episodes so that you can adjust your morals to find it funny and not terrible. It is just a TV show after all.