I'm not sure about Ore no Imouto, but C^3 is not only moe. Of course, there are some moe factors but it's just a part of the whole package. It also have battles,
and some gore. The story is rather dark, since it revolves around cursed tools.
Well, I had fun Ore no Imouto, although it seemed to be only a moe title. You may find number of comments saying that It was a bit different from the usual moe since
actual hate was there between the lead character and his younger sister. Also, in the first volume, there wasn't any romance ( actually, volume 2 didn't have much too) which makes this title different from other moe novels. Also, this novel was classified under Comedy and not Love-Comedy, so I guess it can't be helped that
there wasn't much (or any at all) romantic situations.
One thing's for sure; They're great titles and I had fun reading them.