One thing I'd add to this is something about Shoulder Charge. Yes, it can be countered by a shotgun fairly easily, but with my time with it in Crucible, I've come to the conclusion that you really aren't supposed to shoulder charge people head-on (especially if they clearly have you in their sights). It's an excellent tool for taking people by surprise and for killing those distracted by your teammates. It's also very good for killing people trying to run away, provided you don't pursue them for too long. Now, this isn't me saying that Shoulder Charge is amazing or anything (I've only ever found the ability to be fairly decent), I'm only trying to say the people who constantly complain about dieing to shotguns while trying to implant their shoulder into another person's skull are, quite frankly, using it wrong.