To tell the truth I also noticed the bad moments. Can't call the animation bad, but can't call it good either. Just normal I think?
On to the series I really like how the girls try to abuse Nino-kun. The main char is really the type of guy I like to have as a main character. I have to say I kinda dislike the going against the law of nature thing(fighting against bears/sister fighting a war?/jumping out of the window and getting attacked) since it didn't have a point. Some might call it funny, but I didn't it only distracted me to be honest. I liked the succubus part though, but that on the other hand had a point. I'm definitely watching the next episode.