Not really, well, depends on how you use it if you play a big map with an Assault rifle and a magnum expect to be PWNed all game long.
Try using the DMR/BR as primary then use Assault for secondary that's what I do and I've gotten Perfections in maps like Exile that and don't depend your loadout to get you kills know where power weapons spawn, in Halo power weapons are key not loadout weapons