This may seems biased about the score because I like Kirino's characteristic very much.
Kirino's tsundere part is always unwavering and that made the show enjoyable. It's like never-ending story like One Piece, Dragon Ball, where all characters' habit is constant. But there are also development in skills, feelings and looks.
This anime is semi-harem because the main protagonist made all nearby girls love him. But it's love with reasons not like most harem anime. That's why it's not boring. Love without reason is what you always found in harem anime but not this one. Anyhow, the main protagonist didn't accept the girls' love. You can see why in the series.
The story = 8/10
The art = 9/10
The sound = 10/10
Character = 10/10
Enjoyment = 10/10
Overall = 10/10
I'm not a professional reviewer just only a newbie watching anime so these are only my thoughts. Do not take it so serious. The biased may come from the fact that I like to watch harem and romance anime. And I love tsundere girls.
[LITTLE SPOILER]
Some people don't like the ending because they didn't stay together as a couple but as a siblings. But for me, it's perfect ending so that the show doesn't become an incest relationship show. It left space for me to imagine what can happen next.
