I thought it sounded a bit like an early rehearsal. I hope they put on a better show for the actual concerts. Particularly given what people are paying for the tickets.
As said above, they are getting on. Christine has been a bit pitchy for a while. https://www.youtube.com/watch?v=1VVY5mqpE4g
I don't think they were dreadful on Ellen, but I wouldn't describe it as ... excellent. However, they may have sounded even worse with Lindsey. See the 'Little Lies' video.