I have trouble remembering an update where this same complaint was not registered. Yet I noticed 2 things: 1) people who had run the quests on Lamannia seemed to get first day completions including raids if that was part of the update and 2) within a few weeks either Turbine had toned down the quests or players had learned them because the complaints went away.
The fact that there are day 1 completions shows the quests are not too hard. The fact that complaints gradually end suggests to me that people are usually learning the quests.
IMO the biggest reason for early failure is that people are actually pretty bad at the game. They have a 1 size fits all strategy and they can't imagine making any adjustments in order to best new content.
Frankly, I say let them struggle.