I don't hate any of them really, but FF1 really is the worst of them all. Some may say that's a bit of an unfair assessment; that since it was the first in the series it's not going to seem as good as the others. My response to them is that FF4, and FF6 (my favorite game of all time btw) have held up very well despite each being over a decade old. FF1 had pretty good gameplay, but it's total lack of a compelling story or actual characters keeps it from being very fun in the long run for me.