I play mostly solo and I like the nightmare decks because they bring bad quests back to life. For example, I wasn't playing Emyn Muil anymore....who was? But with nightmare its actually fun now and you actually have to think when playing that quest. There are still some quests that may have good theme and cool mechanics but are just to easy and you beat it without any trouble. My list of the still "broken down" quests are these:
1. Encounter at Amon Din - Not enough villagers die..... rather easy locations and treachery's. Plus, they make any easy quest easier with Lord Alcoran.
2. Long Dark - Just all around its so darn easy. This one maybe needs a 3rd quest card.
3. Druadan Forest - Some people think this is just the most brutal, hard, nasty quest......I have played it 1,2,3 players multiple times and its not super easy, but its rarely a challenge.
4. Road to Rivendell - This one still isn't too bad, but It needs a redo.
Those quests never get played anymore by me because when I play them with pretty much any deck, I just hardly have to think, and there are just never any tense moments..... so not very fun for me.
I like nightmare because it makes good tense games in quests that were before no problem.
Now at that time the Chieftain of the Ringwraiths dwelt in Minas Morgul with six companions, while the second to the Chief, Khamul the Shadow of the East, abode in Dol Guldur as Sauron's Lieutenant, with one other as his messenger." - Unfinished Tales