We need this kind of opinion here, simple and direct.

Well, as long as it is good, I read anything, so I will read Dance manga and Lady Justice. I think that the kind of argument "dance doesn't interest me, boring, boring" isn't valid because we have Hikaru no Go example. I think nobody knew Go after reading Hikaru no Go and it was very interesting and I heard that Go's popularity increased in Japan. Manga is not only entertainment, it is a source of information to learn new things, so it is no good this biased view.
As for Lady Justice, I'm satisfied with Shokugeki no Soma, but if it is good, I will read it, ecchi in the right amount might be good. We also cannot be biased with this.
I never read Medaka Box, but I watched the anime and I enjoyed it, but To Love Ru.... It is an example of ecchi used in the wrong way.
PS: Of course Nisekoi doesn't count, it is not ecchi at all.