I'm sure there are a lot of people out there who are simply too young to remember, but it was horridly overpowered to the point that it was fun to use. That's where the DMR is now. The carbine was nerfed and so will be the DMR.
Man, I hope they tone it down. It makes large maps not fun, between the flinching and how far it can shoot accurately. I love using it, but there's seriously no reason to pick a BR most of the time, and LR/Carbine even less so.
DMR is just too good at range. It's good against vehicles, and people. BR/Carbine are great mid range but won't do as well long range, LR is great against people but blows against vehicles. It just annoys me how easily anything gets taken down as soon as your in the sight line of a dmr user. Big team is really plagued right now, and the whole staying in scope even while being shot doesn't help
I don't know why they prevented you from being scoped out. It make it very difficult to deal with snipers in particular. I think the DMR needs a slight nerf though I don't know how they could implement an effective yet not crippling one. Maybe more bloom? Or bloom that doesn't recenter as quickly? I don't know.