I would have to disagree, based on a comparison with reach. It is far too easy to kill someone with the DMR now. If you are running somewhere, and someone gets a good view of you and opens fire with the dmr, there is absolutely no chance of you turning it around. This was not the case with Reach, as an opponent could easily lose the same fight.
On the other hand, it is nice to be able to get an almost guaranteed kill on an opponent with a primary loadout weapon.
Peace