I think it depends on your MLP distance. I've estimated the M2 to be good to 12 feet. But my MLP is 14. And I listen to movies louder than I do music. The M2 just can't handle the movie onslaught at my MLP and listening level.
Having said that, the M2v4 is better for both movies and music than the M80v2. The M80v2 could certainly go louder but it was not an emotionally satisfying experience as far as imaging, soundstage, fidelity and acoustic disappearance are concerned. Both give a "wall of sound" BTW.
