I, personally, am trying to figure out how I feel about Tauriel. Evangeline Lilly is a super talented actress so it is nothing against her. I am a little iffy about the "Tauriel and Killi" just because, when Tolkien does "cross race" (idk if that is the right word) relationships, it is really important and planned out, and this one seemed really rushed. However, I think that the relationship (Tauriel and Kili as well as the friendship between Tauriel and Legolas) was one of the things that helped push Thranduil's character development from cold and harsh, to someone who sees and cares about the people around him. :)