I'm not saying that Hey! Unfair Baby is a great song, but it's not bad either. Definitely not their worst song ever but it could be better. What I did like was the performance becuase it was very entertaining to me that I enjoyed the song even tough I don't really like the song. But I can listen to it thinking about the performance. If this song is included in the new single, I don't think it'll be the main A-side. It'll definitely be Kokoro&Karada. So don't worry. And let's enjoy the performance with the girls.
I do feel something is missing in my relationship as a fan with the group, but I think that's because there have been less releases lately instead of not having great songs.