Those GMs are obviously doing it wrong - they should be rubbing their players' noses in the encounter level, either to generate tension (if it's high) or to taunt them for having trouble (if it's low)!I've seen pplayers that straight out ask a DM what level was that encounter, when things didn't go their way.
At least, that's how I do it.
Admittedly I have the advantage that (i) my players are fairly easy-going, and (ii) I know them independently of gaming with them. If I was GMing strangers I might taunt them less, but I'd probably also at least begin by being less fast-and-loose in my encounter building, and at least starting things in a zone that's a reasonably comfortable default for the system.