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
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So, I used to run it when I first got in the crucible (don't anymore cause I want the max armor) and it's honestly not great UNLESS you're getting smoked in a fire fight by someone, you go to run, they give chase and you circle around a corner or something, turn around and smash them...that's actually kind of hilarious, but it's a rarity. It's more of a hassle than anything else. Not as easy to use as you might think.