Don't know if OP will even see this but it might be the sniper you're using. I felt the same way at the start of my crucible venture and found Praedyth's Revenge is almost identical to the Halo 2 human sniper from a mechanics standpoint. Handles the same, has similar RoF and target aquisition with 2 body shot kills. Obviously H2 sniper didn't have firefly but you get the point..