Well.. It's Harem and Ecchi genres, whenever it involves both kind of categories together, i wouldn't expect too much about the story and character development, but a good fun, enjoyment and laughter. Mainly, as you know, it's more of a fan service type of anime.
I wouldn't recommend anyone who is looking for a fantastic story and a good character development for this anime. The story progression is quite how you would have guessed as the episodes progress, yet i think it is rather interesting of how the characters are able to use their unique ability.
For anyone who enjoys a fairly good artwork with ecchi and involves harem in it, i can say that you would enjoy it.