I've never heard such mythical qualities...
... being lent to the M2.
They are kind of fun to shoot, I'll give them that. Although, honestly, I liked the M240G better. Nowhere near as much power, but in my very limited experience (IE a couple fam-fires) I found that it was really nice to be able to look through a peep sight, and put the first round of each burst dead center on target, as opposed to walking the dust or water puffs into the target.
What I do find neat about the M2 is that it's still in common use, despite having been designed by a guy who started designing guns in the 19th century.
Kind of like I thought it was pretty neat that the A4 Skyhawk, which flew into the 80's as a warplane, and early 2000's as a trainer, was designed by Lord Thomas Sopwith, of WWI Flying Camel and Scout fame.