The thread "Guarded, Surge, and Unwinnable Games"  made me think about the evolution of quests in the young history of LotR:TCG. People have remarked (and I agree with them) that the first Hobbit quest, We Must Away Ere Break of Day, was better fare than at least some of the quests that had come before. WMAEBOD definitely isn't an easy quest, but it was better constructed.
So what makes a quest well-constructed? What makes a quest an enjoyable hardship rather than a soul-beating experience? While winning is nice, and it has to be possible to win a quest (or at least achieve a result of non-failure), what makes a quest good goes beyond win ratios.
In fact, well-constructed quests will by default be possible to win.
Why is that?
Because the encounter deck is playing the role of a Game Master (the person who runs an RPG session). The best GMs are willing to challenge the players in interesting ways, forcing them to come up with novel solutions and gameplay, but at the same time they build their adventures with tools and hatches for the players to find and exploit, balancing out the badness of the enemies the GM is sending after them. The players should rise and fall on their own merits, not merely by luck.
Another consideration: the best GMs also manage to structure their adventures. It's not just a stream of monsters and events; there are points of no return (which in LotR:TCG correspond to the turning of the quest card) that bracket different textures of story. Pacing is key; you don't want adventures to turn into The Hills of Emyn Muil, but at the same time you don't want a solo Escape from Dul Guldor.
To make my points more clearly, let's consider a tale of two quests: Conflict at the Carrock (CatC) and WMAEBOD. CatC is part of the Shadows of Mirkwood Cycle, coming after the Core set. WMAEBOD on the other hand is part of the Hobbit Saga, coming after Core, Mirkwood, Khazad-Dum, *and* the Dwarrowdelf Cycle. Both concern trolls and sacks.
But these two quests are like night and day. CatC can be irrevocably lost quite easily even with your best preparations; on the other hand, WMAEBOD earns every hit against your party because it offers so many counterbalances to the threat it brings to the table.
To explore these counterbalances further, let's consider the following:
- The sacks
- The trolls
- The pacing (or lack thereof)
- The objective cards
- The Carrock and the Cave
In CatC, Sacks are treacheries that can come at any time during play and target solely heroes, and their effect can't be canceled. You get 1 + X of them, where X is the number of players, come in an encounter deck with 42 additional cards. To make things worse, the treachery Roasted Slowly not only destroys all sacked heroes outright, but gets reshuffled into the encounter deck after play. There are two of them.
When CatC turns on you, it does so through luck. You can get hit with an early Sack, which also kills resource generation, at which point you're doomed unless you're running Miner of the Iron Hills or you manage to kill a troll… which you can only do in stage 2 of the quest.
By contrast, WMAEBOD will only introduce sacks during stage 2. WMAEBOD sacks are also more varied, and can target allies and/or heroes with different characeristics (like having the highest willpower). This means that sacking has variety, but it's a predictable variety. Most sacking is also predictable---you know it'll happen when a troll engages you, though there's a treachery that can cause it to occur. WMAEBOD additionally gives the player a simple tool to combat the sacks: Troll Camp combined with Bilbo Baggins and the Baggins resources.
WMAEBOD gives the players more control, even while it expands on the number of sacks from 1+X to a full 7.
In CatC, the four trolls all have the same engagement cost: 34. That means when you trigger stage 2, you better be able to stay under 34 threat for as long as it takes to selectively kill 10-HP trolls. And you better kill all four trolls, just to win.
In WMAEBOD, the three trolls have staggered engagement costs: 23, 33, and 38, giving the player some necessary breathing room. But what's interesting is that you don't have to kill the trolls to win WMAEBOD; you can run out of cards in the encounter deck (in stage 2 all progress tokens placed on the quest turn into cards discarded from the encounter deck), simulating the arrival of dawn that turns the trolls to stone.
Again, the players have much more control in WMAEBOD, even though WMAEBOD ups the game of CatC by having its trolls constantly buff one another instead of only buffing when engaged.
Stage 1 for both quests seem similar: quest slowly until you turn up either Grimbeorn or his Bee Pastures (for CatC) or a Troll Camp (for WMAEBOD). However, what turns up while you're questing this way is quite different. For all that WMAEBOD is a treachery-filled deck (16 treacheries, 11 locations, 3 enemies, 2 objectives), the locations and enemies of CatC (19 locations, 9+X treacheries, 15 enemies, 1 objective) are far more problematic. Treacheries will raise threat or kill characters, but then they pass. Enemies and locations have a way of ganging up on you, especially if you're trying to quest slowly.
WMAEBOD, while it has very very cruel treacheries, is actually more attuned to the players' goals than CatC.
The Objective Cards
In CatC, Grimbeorn is one of the best objective/ally cards ever, and once you have him you're set for stage 2. However, you'll only have a chance of worse than 1 in 10 to find himself or his Bee Pastures. And he's almost necessary for victory unless you're running Erebor Battle Master in a dwarf deck.
In WMAEBOD, the objective cards Troll Key and Troll Purse aren't vital keystones to winning, just a way to search for treasure.
More luck ruled out unless you're gaming for treasure. (In fact, this is almost the way a human GM would handle a win-versus-win-and-treasure situation.)
The Carrock and the Cave
Both CatC's The Carrock and WMAEBOD's Troll Cave are specially set aside (the first in the staging area, the second out of play). The Carrock buffs trolls when active (as it irrecovably becomes when stage 2 is revealed), which means you need to quest to explore it in addition to trying to kill four trolls.
Troll Cave is, on the other hand, just there for treasure hunters. It's an interesting other objective to meet that only nominally makes life harder for someone seeking to hurry the dawn.
Which makes WMAEBOD not just well-constructed, but also replayable with different winning conditions (race through the encounter deck to meet the dawn, or kill all trolls for victory points, or explore the cave for victory points, or get the Troll Keyand five Baggins resources (or two and Troll Purse) and the cave for the treasure.
I give WMAEBOD mad props for going beyond being a good quest to being a great quest.