In terms of strong theme, this encounter pack probably isn't as engaging as some of the others. The lasting impressions of it after many plays are this--you need to quest a lot, because the paths require many tokens to complete, and you need to watch out for the Sleeping Sentry. There are enemies with the ambush keyword, but what that means is if you are prepared for a surprise attack, ambush can actually be helpful, as it helps prevent enemies from contributing shadow during the quest phase. But, the Sleeping Sentry absolutely warrants some significant discussion. There are two copies of this card in the encounter deck. You must account for them. When they come, (either by revealing from the encounter deck, or as a shadow effect in combat--doesn't matter which as they are both really bad) it is devastating. If you can't counter it, you're likely going to lose, almost instantly. You can (and must) design your deck specifically to account for Sleeping Sentry (A Test of Will, Hasty Stroke, etc.) if you have any expectation to win consistently. I am not a fan of a single card this powerful, and certainly some will like it and some won't. I believe in "easy mode" the Sleeping Sentries are removed, which prevents this issue, but then leaves a fairly bland encounter that isn't all that fun.
Discussion of the player cards. The hero is Elladan. He's an ok hero, but only if you use his brother Elrohir--Elrohir is the better hero--I prefer the defensive bonus rather than the offensive bonus. Together they provide a strong attacker and a strong defender, and both quest for 2 willpower. If you do not intend to build a deck using the Elladan/Elrohir combination, then this hero simply is no value to you--other heroes are much better. Note--Elrohir is in the Redhorn Gate adventure pack. I have combined Elrohir and Elladan with an eagles concept and done quite well with it. There are a couple good player cards for the Secrecy concept (Dunedain Wanderer, Out of the Wild) that aren't useful in most other deck concepts. Rider of the Mark is a strong Rohan ally. Lure of Moria is good for dwarf decks, as is Bombur, although his ability is not limited to dwarf decks, but rather is tailor-made for the Moria themed encounters with many underground locations. My favorite card out of this pack is the Rivendell Blade--one of the strongest weapons (and low cost) printed so far, but with some limitation of who can use it. Elladan and Legolas are great heros for this card.
So, overall, this pack is 3 out of 5 stars. I like the encounter (but don't love it), and I hate the Sleeping Sentry. I use Elladan and Elrohir together quite often, but I'm probably an exception. The player cards are just ok with one card I really like (Rivendell Blade).