What do mean it's not for kids?
Actually the fact that Regular Show can be for kids, teens, AND adults is what makes it break the ghetto.
The content may be a tad risky for a "kid's show", but really not anything worse then what a child would hear anyway. Or that most parents would mind their kids witnessing anyway.
Plus it has really good humor and 80's references (but not overboard like Family Guy).
I like it, I know of kids that like it, and you know who else likes it? MY MOM!! (seriously!)