Well, psy made one overrated horrible song, but LMFAO is a disgrace to music in general. Especially party rock anthem.
Let's face it, that melody is bad enough, but LMFAO's rapping skills are just... (sorry) worse than Soulja boy, just listen to the lyrics.
I would comment on their dance too, as a shuffler, but scince we are talking about music, i'm not gonna.