The M-50's are very good for music, even video games, I use them when i play battlefield 3 on the PC. But they don't have a microphone for stuff like skype or ventrilo.
A lot of people have this impression where "gaming" head phones are the shit! You need them to be really good!!! But it's actually not, you're paying loads of money for 5 or 7 shitty drivers(for lack of better wording; I forgot the actual name) while you can pay the exact same money for two really good drivers aka, better audio quality. I was once under this impression until Alen re-educated me. h4h4
The term "gaming headphones" is just a money making technique much like how Beats are very expensive for I want to say bad quality but it's more like not up to par to the price but the brand name makes people buy them.