This is a thread about your opinion on the difficulties of each xpansion pack in terms of how the quests are built, the difficult of the enemies (through all the various settings), and length/puzz/complication of the quest.
This is in reference to a fresh player doing each quest for the first time.
From most difficult to least difficult.
1.) Saltmarsh (heroic especially)
2.) Sharn (both H and L)
3.) Isle of Dread (both H and L)
4.) Feywild (both H and L)
5.) Ravenloft (especially L)
6.) Shadowfell
7.) Menace of the Underdark/FR stuff.