Well, like I said, it's because I knew everything about Madoka beforehand so it didn't seem so bad.
Tougou is certainly head over heels for Yuuna, people could make some points about Yuuna not being in love with Tougou and just being a really good friend. But yeah, I think Yuuna is also in love with Tougou, it's just her mindset isn't anywhere near love or like. As for Karin, her first story in the first VN more or less confirms she has a crush on Yuuna Yuuna sleeps over at Karin's for a study session and seems like there is a few more moments in the second one, though Sonoko ships Fuu x Karin.