Made me care about people.
Made me hate people.
Made me care about people I hate.
Made me care about people I should hate.
Made me uncertain about my allies being enemies.
Made me uncertain about my enemies becoming allies.
Made me need to know more about everyone, regardless of whether I like or trust them or not.
Do not stop.
(Also upset me when I reached the end and several characters are no longer available to chat with, likely to return, but off limits at the cliffhanger. Annoyed about that, but in the end its proof I'm invested beyond surface level.)
EDIT: Note that all of these statements (apart from the annoyed part) are to be considered praise.