Without knowing the full context of this quote, to me it's not saying dungeon crawls are not fun. It's saying traveling down that 10-mile long corridor deep into the mountain *with nothing there but the continuing corridor* is not fun.
I had a DM who would mention every freakin' 10 feet of the passages we went down. "You go 10 feet, 20 feet, 30 feet, 40 feet, then you come to a cross-corridor," with a little pause after each. He always did this, sometimes for a 100 feet of nothing but continuing tunnel. One time he was doing it and we were all tired of it, so after he said, "40 feet, 50 feet," we interrupted him and told him to just tell us how far we go till we come to something.
"Oh, okay," he said. "You walk down the tunnel for two hours, and then you come to the cave mouth overlooking a cliff."
<facepalm>
We turned around and trekked the two hour hike back to the dungeon.
Bullgrit
Wow that sucks. What a horrible DM.
However, I don't think your point is a strong one. This is like taking "encounters with dragons aren't fun" to mean that every time you have an encounter, it will be a dragon, and only a dragon, and you'll have 10 of them per day, every day.
OF COURSE taking any element to an extreme isn't fun. Monty Haul campaigns can grow tiresome (but you don't hear people saying treasure isn't fun). Super high difficulty, all the time, campaigns aren't very fun for your average group (though for your hardcore group, maybe). Superr low difficulty, all the time, campaigns aren't very fun for most groups (maybe for a group that primarily gets together to socialize).
But he didn't say "extreme elements aren't fun because things need to be done in moderation". In fact, the quote seems to suggest the
opposite (that we need MORE ENCOUNTERS and less of everything else). It suggests a style of "GET TO THE ENCOUNTER!!! GET TO THE FUN!"
The retort to "
Long treks through endless corridors in the ancient dwarven stronghold beneath the mountains aren’t fun." is "
Yeah, I agree, because a two hour long journey done in 10' increments wasn't fun."?
If so, then "
combat encounters aren't fun." Because combat, combat, combat, combat, combat, combat, combat, combat, combat, combat, rest, combat, combat, combat, combat, combat. Isn't fun.
As has been stated, it's the extremity of the statement, but beyond that, it's ignoring a more exploratory (some might say sandboxy) style of play that D&D has always done quite well. There is no reason 4e can't do this just as well as any other edition, but the quote posits that this isn't the
right way to play.
Also, experienced dms will give the advice that "empty rooms
matter." This is more than just empty rooms, it includes an attack from lvl 1 brigands when the players are lvl 10, or a moment describing the music playing in the bar to set atmosphere, or perhaps even a 2 hour journey into a mountain tunnel (where there is maybe 5 minutes of description of the incredible depth to which they've travelled, the lack of light, the feelings of heaviness above them, etc.