For players in that position, yes, low-level dungeons are too easy. But, as Taepsilum points out, players with years of WoW under their belts ought to turn back the clock, to let the Ghost of Azeroth Past take them on a journey through time to their first ever dungeon. Hopefully they weren't as foolish as your writer, and didn't select tank without really realizing what it meant. The low-level dungeons have, at least to some extent, to cater to players who have never been in a dungeon before.
And, of course, for the lower levels, dungeon leveling has to contribute an equivalent amount of XP per hour to questing, or nobody would ever go into dungeons at all. But, as another poster in the same thread commented, perhaps it would be possible to open up heroic difficulties of dungeons at lower level to players who wanted a challenge?
Filed under: Mists of Pandaria