the AI, not that it was used but the way it was done, you know that way movies exaggerated technology to be more advanced then it is, that what this is in this film, The Idea was okay but it just could have been better if it was more grounded in reality then this obviously fake version of it, and obviously even better if it was actually Stu.
and I think that's what people are taking out their frustration of it not being actually him on what they got.