The card is not so situational as it seems. Really what your paying for is 3/3 soak body slot. It can cancel a specific Type of treachery that you have to draw, but it does that at a cost of 1/1. The treachery will have a worse effect but not likely twice as bad as 1 damage and 1 horror. Just use it if you want the armor and the other part is a solid upside that certainly doesn't need to happen for you to be happy.

2 xp card for a fast Old Book of Lore use/Eureka effect for each player, but you can't always control when it happens because it's a dilemma. That sounds expensive, but possibly justifiable.

But, you also get all of the weaknesses you don't choose back for free! And you remove all of the non-weakness cards (which you put in your deck, so you probably want them, with the possible exception of a few signature cards if you don't build your deck to use them) from the game instead of discarding. And the card is Survivor, which is the class who can recur things.

The deck-thinning means you probably don't want to recur it, so it's a single-use event for 2 xp, with drawbacks.

He's a great partner for Agnes Baker, as someone noticed. Played whole Carcossa campaign and can't imagine it without that fella in, the value is just insane. Since he's the only ally I played in her deck, it kinda turned to a strong cougar feeling (here's my young boy), but no regrets there.

That +1 to running may seem insignificant, but it helps you against treacheries and since you also have access to Survival Instinct, you can take advantage of that.

4xp to get +2 once per turn and an option to remove all doom and not just 1 seems way too pricey. If it gave an additional clue then it could be good in doom decks, but this way it is too much xp for almost no payoff.

Fun Fact, Soothing Melody has the Spell Keyword, meaning that somebody taking Hallowed Mirror (lvl 3 especially) and combining with an Arcane Initiate or some other way to search, can put out a lot of healing, especially towards the end of the scenario when the deck gets thin, without being too prevalent in the normal Card Draw. Also, because Soothing Melody can heal Allys, a few like Beat Cop, Grete Wagner or Agency Backup might get more uses than Expected if you mix them in with Charisma.