I dont get doing all the covers either, if I were a successful musician (LOL) I would like to do some covers but they would be more obscure than some famous artists best known work. We played LAM in our early 90's cover band and I hated it, kinda repetious at that time for me. Today I would accept it as a fun song for bar gigs.
Also, the day will come around when songs by Disturbed will be classics to that generation. Myself I think the guitar player has great riffs and grooves, along with the drumer, I rarely pay attention to bass players and I grew to like the vocalist. My drummer a huge old school Metallica, Megadeth and Testament thrash fan (in addition to Maiden, Priest, Sava, ect.) turned me on to Disturbeds first two or three CD's and I kept them in rotation for quite some time. I dont totally get the point of the "motherfucker" song but its a kick ass tune otherwise.