I've played the first scenario four times now, twice with each of the suggested decklists at the back of the booklet inside the box, and I've only come close to defeating the troll brothers once. How the first scenario works is thus: It's divided into three parts. The first part only requires seven progress tokens to complete it, and the encounter deck is lacking in any type of enemies, so this is pretty easy to accomplish. In fact, the first time I attempted it, I breezed past the first part on turn one.
The second part is when the trolls come out to play. Tom, Bert, and William come marching out along with their troll cave, and spell doom for my party. The threat amount they dish out is enough to make you almost lose the game (and engage you, if you haven't made it to 50 threat) if you're not careful, so to mitigate this, I engage one on my turn. The problem with the trolls is that each one imparts a special rule to all of them. One makes it so that the trolls can only be fought by one character (and at armor 2, with 10, 11, and 12 wounds respectively, this isn't easy), one makes it so that no damage can be inflicted on them while in the staging area, and the third won't allow you to play attachment cards on them.
Now, it's still preferable to engage them, because if I don't, they engage me, and that means I draw a card from a deck of "sack" cards. These cards are only bad, as they immobilize various characters (each one's different) for indefinite periods of time. This means they can't do anything until the sack is removed (at which time it's put right back into the sack deck), and these opportunities come infrequently as I've found out.
Needless to say, this is a tough scenario. It only ends once the trolls are defeated or the encounter deck runs out of cards, in which case the sun comes up and the trolls are turned to stone. That's the third part of the scenario... It just ends. So really, the meat is in the middle.
So now I've tried each of the pre-made decks twice; it's time for me to deckbuild. I want to stick with heroes and allies that were present during the age of the Hobbit, and not stray into any LotR-era characters. I've never built a deck in LotRLCG before. I'll post it up where when I do and tell y'all how it went.