I am perfectly happy with allowing promos which are reprints of cards already in existence within the block.
But Mr. Underhill is not a reprint. Despite the same text as
Reluctant Adventurer, it is a different card. Even though the only difference is the signet, it changes things. The addition of these other promos really does seem benign and as far as
Boromir, Steward's Heir and
Eomer, Forthwith Banished are concerned, they don't really provide that significant an advantage.
Eomer has already been discussed a bit and despite his potential low cost, he is still weaker than
Eomer, TMoR and thus provides a minor enhancement to only few deck types and that's not a bad thing. It won't make those decks OP, but it will provide more options.
Boromir, Steward's Heir is a nice addition. I always wondered why there isn't a Ring-bound Boromir (with the exception of
Bearer of Council) when he was definitely drawn by the ring's power. He will most likely be used in Ranger or Knight decks. Honestly, he is not such a great addition to Knights - not much is gained. He is a very nice addition to Rangers and that is also not a bad thing since Rangers are much underplayed and not as strong in movie as they were in TTT or TS. And if people wanna splash a ring-bound companion,
Faramir, SoD is still a far better choice.
As I said, we are already working on Virtual cards which we intend to implement into Movie Block so why not use cards that are already there? Especially since none of those cards will have that great an impact on the Block, but they add a bit of flavor to it.