First: I don't mind the leveling system.
Second: Agreed, we need a search engine!
Third: Sniping is it's UNSC-assigned purpose! Did you know that some bullets actually fly better shortly after they leave the barrel, rather then inside the barrel itself? Look it up! And arguably, the Battle Rifle can kill just as fast as the DMR, with the same range; same with a Carbine after some practice.
Fourth: Agreed, to an extent: the firing rate needs to slow down. The damage per bullet is fine, as it seems to be adjusted to the same as an Assault Rifle.
Fifth: Agreed, needs more damage and some more battery life on the Storm Rifle. On the Carbine, MAYBE a little more damage, and absolutely needs more battery life.
Sixth: I find it balances as a single shot, similar to a Magnum; to an unstable variant of a single shot from a Shotgun. Simply a hybrid of two guns.
That's just my thoughts .