Gotta say, I've never encountered the "running" phenomenon people so often complain about. Yeah, people will dive and run if they're at a sever disadvantage, but that doesn't count since its tactialy sound regardless of what you're flying.
Yeah, a few people just trying to pick, and then high-tailing it if they fail. But I saw just as many spitfires and F4U's doing it as I saw P51's and 190's.
I think people focus more on the faster planes because, flying a spitfire or other similarly average plane, they're usually unable to re-engage and thats "not fighting" because they wanted the kill, and clearly anything they can't counter is unfair. But when a slower plane does it, thats fine because they can re-engage if they think the lost of E is worth it.