I'm very much not a fan of the idea that the fate of the Elves is somehow linked to mithral, or the presence of the Istari in Middle-Earth in the Second Age, or awakening the Balrog very early, or Barrow Wights when there shouldn't be any, or pretty much everything they've done with Tom Bombadill. Do any of those count?
All that being said, adoptions will make choices I don't like, and I'm there are many things I do like. Most of Numenor, how the Dwarves are portrayed, how Saucony is portrayed, the idea of Adar, the visuals are also very nice.