Ok, first off, getting to the max level on any multiplayer shooter isn't gonna be quick, that's just a fact. I just bought this game recently and I will admit, Im not very good at all. Getting 3 or 4 kills in an entire match will make my day. But anyway, try completing some of the skill assessments. Some add like 2500 xp and that's kinda alot if you're getting 3000-4000 xp every match. Im level 16, and again, im not very good, but compared to when I first got the game about 2-3 weeks ago, Ive improved. And when you improve, it pays off in xp. Now if you're just trying to get to level 50 because of the trophy (Im not saying that you are), it's gonna take longer. Ive discovered that aiming for certain skill assessments pay off in xp. But anyway, just have fun with the game and keep improving and evenually you'll be level 50.