With the changes to brawling and 2h on test (and once the change to rifle is fixed) I think MA is the only weapon with a bb that doesn't have a pseudo cast bar of approximately 1 second atm. So, I think MA has the only bb you can clip without losing any damage when you bb. While I love MA for pvp it doesn't seem right that it should have such an advantage as this in pvp.
Primal Burst also doesn't have a cast bar. I agree a cast bar should be added to both but for Primal Burst if it is added it would be nice if the animation time was slightly slower to suit.
I completely agree with Wandering Comet. MA should be subjected to the same delays as all other weapons.