Yes, the whole point is that it's Death Eaters in general - the implication is that all of them were powerful fighters, such that a veteran Auror with 80-90 years in the force brags about just surviving a fight with two at once.

I don't think they were all supposed to be powerful so much as they're all familiar with violence. A two on one fight is a lot more than twice as difficult as a one on one fight, so fighting two death eaters at once and not losing means he would have to be a lot better than they were.