No one is ever going to be happy with anything they do with it, if anything I think the dmr is the far worse weapon that thing is so useless now why even have it?
The problem is, is that 343 has to balance weapons from 3 different factions that experience frequent overlaps. Take the Lightrifle, DMR, and Carbine. The Lightrifle is the slow firing, high damage version of the DMR whereas the Carbine is the fast firing, "low" damage version of the DMR. Where does that leave the DMR? Well... Not in a great spot, as you've noticed. It doesn't have the abilities of the LightRifle nor the Carbine to make it functionally different, so it ends up in an awkward spot of not having much viability. At this point, removing the DMR from Halo Infinite, if they plan on keeping the LightRifle or the Carbine, would be the way to go.
Welcome to the problem of having a game where there are 3 versions of practically every weapon (which means that one of those 3 is going to be getting the short end of the stick) and having mechanics ripped from Call of Duty in the sandbox that badly affects how certain weapons function.