I agree with the Chiyo part you mentioned. Over time, I just abandoned the Kiyoshi x Chiyo ship, totally went for Kiyoshi x Hana ship instead. The latter is more interesting to watch overall, haha.
To be honest I enjoy this series a lot. The plot sometimes go from very real to very ridiculous (chapter 60: nipple hair battle), but it's all good.
I would recommend it to any manga fan, as long as they don't mind the ecchiness that comes with it every now and then.