It's pretty obvious who can finish every map in a minute compared to those who have to wait then get bored then leave. That's the problem. People leave because they get frustrated when they lose nearly immediately. The only redeeming quality for a newcomer is being Death, which doesn't mean much when regulars speed through the map. There's definitely a skill gap.
Have you even played DR recently? I don't remember seeing you on in the past few months. As a regular on Deathrun I assure you that these individuals only win 4/6 of the time depending on who the deaths are. I'll agree that there is a skill gap. But only in the lack of knowledge of how to kill these players. It's a lot easier than you are making it out to be.