I think Kit gets a lot of unnecessary hate as an actor. He’s been pretty good in roles outside of Thrones and I know he wasn’t close to being a standout in the last season, but it’s really not an exaggeration to say he was working with an awful script.
I personally still think the actual eternals will get more screen time. The film spans thousands of years and there’s been no indication that the Black Knight is a thing yet, so he will probably only be in the present day scenes.