How Do We Evaluate a Postseason Offense?

Cavs' relative offensive rating is about double in this playoff run than their regular season relative offensive rating. But the level of the caliber of opponents that they're playing in the east at this point like this Celtics team bent this is just a weak team to make it to the conference finals at this point. I don't know how do you judge how good this team and this LeBron are when it comes to the really weak competition they were playing and just how much better they were because  I think they were they were better than the regular season numbers say but I also don't think they're nearly as good as their bloated postseason numbers says.