Gleowine (or, if you're matthew dempsey, Gleowinny), is a pretty good card. I don't know of anyone who actually uses that single willpower stat or the two hit points, but an extra card a round with no downsides is a pretty good deal for two resources.

Henamarth Riversong is probably the best (non-gandalf) ally in the core set. One for one and one is pretty good, but that ability crowns all! It pretty much shuts down the encounter deck in a single player game. If you're running a lore hero.... and not Henamarth.... you're doing it wrong.

Erebor Hammersmith is pure gold even outside of one of seastan's broken decks. Two for one of anything is good and three hit points to boot. His discard mechanic is just icing on the cake. If you're running Dain this guy becomes two for a massive two, two, one, and three!

100% staple for multisphere decks. He'll get your money where it needs to go, and won't charge any of those goddamn fees - in fact, he'll even take a couple arrows or a sword to the face for you. It might not seem significant, but he provides a lot of value for one resource. Gondor trait is an added bonus, but he fits into a ton of decks without any effort.

Not really worth playing - basically a much worse Envoy of Pelargir. While Envoy refunds one of your resources, the Ship Captain is straight-up paying two to redistribute one. You'd have to have a ton of purple and basically nothing else to make that trade palatable. The only bonus you get for double the cost is an extra hit point, but still weak stats. He does have more potential targets in the odd case that you don't have Gondor or Noble heroes that work with your resource smoothing, but at that point most people would use the cheaper and repeatable Errand-rider.