should you play dvds on ps3?

[Lt. Aldo Raine]

I kno that the ps3 can read and play dvds but is it smart to use your ps3 as a dvd player, i use it for dvds sometimes since i dont have a dvd player and really dont feel like buying one, and whenever my friend sees me use it hes like " its not good to play dvds on ur ps3, sure it can read them and all but it was made for blu ray discs,it might break", should i listen too my idiot of a friend? lol
should i save my money and buy a upconverting dvd player or is the ps3 fine..