It's a show that definitely gets better as it goes on.
In the beginning it plays things straight, like any other sitcom, but as it progresses it grows more and more until it gets to a point where it's actively subverting not only the sitcom genre conventions, but doing so in the style of homages to other genres of TV show and film.
It's also not afraid to take a joke all the way to its most ridiculous conclusion. It's got balls of steel for a prime time NBC show.