The End to all DMR Arguments
In my test, I had 2 controllers set on splitscreen. I held a controller in both hands. The controller in my left hand had an automatic weapon, since my right index finger is much faster. In my right hand, I had a DMR.
On default damage settings, I had both controllers fire at the exact same time. I was unsurprised to find that the automatic weapons won every time provided every shot lands. The DMR user was unable to land the final headshot during every one of these tests.
What this means, is that if the automatic weapons are doing their maximum damage per second, they will win. Due to the inaccurate nature of these weapons, they would be best suited to close range, as they will be hitting most of their shots at that range.
Automatic weapons are finally viable options up close, and do their job very well. A DMR user can only beat them if the automatic weapon user is outside their niche. Now that I have learned that these weapons are all fine together, that leaves the Light Rifle, Battle Rifle, and Covenant Carbine. The Light Rifle has a lower kill time when unscoped, and can only achieve its maximum damage potential by having a scoped-in shot. In close range, scoping in removes your ability to aim as accurately, and cuts off peripheral vision. In other words, the Light Rifle is fine.
What this leaves is the Carbine and Battle Rifle. In its current state, the Carbine is unable to compete with the DMR due to its slower killtime and inaccuracy. To fix this, making the Carbine a 7-shot kill as opposed to 8 gives the weapon a slightly faster time to kill than the DMR, but without the accuracy to allow it to compete at range.
The Battle Rifle needs a similar buff of subtracting a single bullet from its total to kill. The BR would then take 12 individual bullets as opposed to 13. If a player can land every single bullet, they are rewarded with a faster killtime than the DMR. What makes the BR not totally dominate the DMR is the recoil that needs to be controlled, since even a single bullet missed will spell out death.
TL;DR- The DMR is scientifically proven to be fine. The Carbine and BR are just underpowered.