Yeah I think attributing this purely to a skill issue runs the risk of excusing/misdiagnosing lethargic play.
In a low-skill mode, it's hard for skill to make much of a difference. What does make a difference is people not engaging at all.
Somewhat surprisingly, I've found the worst of the lethargic offenders frequently queue in with friends (clear by their discussions in party chat). This is irritating since it makes them basically immune to vote-kicking. Maybe that's the idea?