Simply put, this anime doesn't deserve the condemnation that the vocal minority are currently giving it. Just look at the MAL rating compared to the top like 6 most "helpful" reviews. For this rating with so many 1s... means there are FAR more (on a scale of far more than 2:1... since most people don't give only 1s and 10s) people who found it to be enjoyable in some way.
There is nothing spectacular or innovative about the story/art/etc... However, in order to be enjoyable doesn't require any of that. This is an ecchi harem(ish) anime, you should never expect it to be ground-breaking just based on the genre. It has a solid story, standard art, decent voice acting, at least ATTEMPTS to form some character backstory (which alone makes it impossible to be called the WORST anime in existence), and is oddly relaxing and enjoyable to watch.
This is a simple anime. Nothing complex. It's short (only 10 REAL episodes... plus an obligatory ecchi trope of girls on the beach OVAs). And it is simply enjoyable.