Ahahaha, Tadano is the second-best girl (after Komi-san of course)
But seriously, Tadano as a girl is pretty decent. She is cute in the plain way.
And it seems like Katai-kun considered Tadano as a love interest or similar, as evidenced by his thought that he shouldn’t be charmed by other girls when he already has Tadano. It might also be essentially “bro before hoe” kind of things. I realised that this is just a joke though.