Well it can be frustrating but I'd recommend to stick to fusion rifles and learn how to use them correctly. If your aiming is correct that's usually one blast kill. Shotgun works well on some maps but I found it unreliable due to network issues (seriously Bungie fix the netcode. It's not even funny). Also class with some kind of void damage works as well. I'm a Warlock so it's a bit easier but still. Just keep playing Crucible and eventually you'll get good. I'm mostly PC fps player and had to learn how to PvP with gamepad. Frustrating it was, yes, but in the end satisfaction of achieving hard goal is worthy it + on top of that I'm now decent with a pad and PvP in Destiny is very satisfying and good. Only this network (comes from BF4 player). This needs to be fixed as it's unacceptable in the long run.