There are still power weapons to control. The DMR is a utility weapon; it is meant to give all players a fighting chance off spawn. When I have the misfortune of playing AR starts, my range is too limited for me to want to venture around the map. When I do get my hands on a precision weapon, I feel like I should have had it all along. Finally, it is much less satisfying to out-DMR somebody who is AR spraying from too far away.
I actually like AR starts because it usually means that I get a pistol secondary, which happens to be my favorite weapon. Not only that but I get to destroy easy mode enemies who only use the AR and ignore their secondary.
Also I'd like to point out that the DMR doesn't take as much skill as people are making it out, if you manage to miss a single shot with it you haven't been playing FPS games very long at all.
[Edited on 04.13.2012 11:01 AM PDT]