Lacks realism. It seems like sometimes uses random and generic answers for what you say and often humours you. Has no personality at all. If you write too much it only grabs a word of the story and assumes that's the topic you are talking about, for example if you tell replika you watched a sad movie yesterday and proceed to describe more, they'd ask you "why are you sad?" because "sad" is they only thing they picked and assume YOU are sad.