I dont know why most all of the member of MAL score this badly
In my opinion ISLAND have a unique story based on a Romantic, Sadness, and time travel.
in beginning episode you will be find loli and other fucking stuff in it.
but you must be know that most of all anime have an story introduction. i think most of all anime have story introduction in rage of episode 1 to episode 3 or 4.
in beginning episode you shouldn't skip anything, just stay and watch it until finish. Because you will lose the main story in beginning.
Next to the my score of this anime
STORY (10/10) : Why i give 10/10? because main story in middle episode to the end of the story have unique atmosphere, that you won't miss any sec on this anime. (REMEMBER YOU SHOULDN'T SKIP THE BEGINNING OF ANIME OR YOU WILL LOSE THE CORE OF THIS ANIME)
ART (9/10) : I think all of the art is ok, i didn't see anything wrong in art section
Sound (9/10) : I don't know why but i feel the sound of this anime is good enough XD
Character (10/10) : For character i think this anime have very good art and animation
Enjoyment (10/10) : I belive if you watch lots of anime you can compare and says this anime is best from other drama anime (in this case anime like grisaia series that have dark story)
Overall I THINK 10/10 is worth
i think this anime will have same or maybe will above the grisaia series anime