Onii-chan Dakedo Ai Sae Areba Kankeinai yo ne! Is a typical harem anime. Of course if we are talking of a typical harem it also includes a lot of Fan Service. It is packed with a lot of dirty jokes. and many more that might be considered adult piece. But be aware it is not a hentai anime!
Story/Enjoyment:
It has a great story. It has a lot of funny scenes. The jokes were never boring. And I cant say that it has a clear plot. Because it did not really stay on a clear path for each character. Well its still fun to watch. Especially when you are bored and just want to laugh hard.
Art/Sound:
It has a great art. It really made the show watchable. Sound is great. the OP and ED is great. Voice actors are good. Nevertheless it made the show great!
Character:
The most loved part of the anime. Each characters is packed with different personalities. In this anime every character was shown off. Although Ana and Akiko did get a lot more dedicated episodes of them. Either way every character is great! Down to the design and their characteristic.
Overall:
It is a great anime to watch especially if you are a fan of harem's. I think. I will rate this Mild. Parental Guidance might be needed. It has a lot of dirty jokes. But that what it makes it fun :))
N.B.
Sorry for the redundant info's in each categories. It is just my 2nd review so pls. bear with the noobness :))