The problem with Luclin was all of the leveling content that made the old world irrelevant. Paludal caverns single handedly emptied out Crushbone, LOIO, UGuk, Unrest, etc., and that was just the beginning.
The best part about Luclin was Ssra temple, that whole dungeon was a great EXP and raid location, but VT had a harder key grind than VP, and then the trash was a pain and the bosses were easy (Thott's
Luclin Uber Content post).
The good thing about Velious and PoP is that they did not rewrite the low-level game. Velious didn't have content for players sub-L35, and PoP did not contain content for players sub-L46. If they could make Luclin not have content for players under L40-50, then it might have worked out better. Also, while the new rings in Luclin were good, VT needs to work on the balance of trash-vs-bosses.