I dont have a problem with the kick itself but I have a problem with the 'range' at which you get stunned at. You shouldn't get stunned unless you're taking cover or standing right up against the cover. IF you're 2 or 3 feet back you shouldn't get stunned.
Also another problem i have is a lot of time when i go to mantle kick over the wall, my guy runs around the wall instead. That needs to be fixed.