Frequent cussing is a sign of lazy lyrics but if the lyrics aren't intended to be very meaningful or clever, then there's no problem. Not everyone is trying to be a lyrical genius for hip hop. Oftentimes the music just serves a utilitarian purpose, to make people dance and move their ass.
Believe it or not, the majority of people are not music aficionados like the most of us. For most people, music is just an excuse to pass time quickly and make more bonding experiences with friends. They are there for drinking moments, dancing moments, or just general moments to make you feel awesome for some reason (mostly where image plays a bigger role than the actual music). It is why some drunken idiots request hip hop or pop to the DJ on a trance night. Artistic integrity and complexity takes a backseat to those things.
Like vagrance says, art shouldn't need a commentary...it can just be there to make you say "ooh, ahh" and form your own thoughts that the artist had no specifics on.