Actually read this before commenting.
I think that shoulder charging out of a slide is ridiculous. Also in mid air. To shoulder charge you have to be running, not floating or sliding. It just doesn't make any sense and shouldn't be in the game.
Edit1: It's not the midair SC that bothers me as much as it is the slide
-
Easy answer. Shotgun. As someone that runs shoulder charge it only works about 65% of the time. Most of the time I get shot gunned down before hitting it or I run out of time at the last second. The only time it works is when you catch someone around a corner or the enemy isn't watching their radar which is their fault.