Well you have to put FFI's ending in perspective. I mean it was on the NES and it was the first game. You have to forgive them a little because of that. My favorite would be FFVI because of the overall style, it put focus on the characters individually, even the ones who had little to no storyline, played their themes, and had a very nice presentation. My least favorite would be either FFIV (yay! we've saved the world! now everyone gets to be a king! 'cept Kain, cuz he sucks!) or FFVIII (okay, let's show a bunch of totally random clips that make no sense and then show Squall and Rinoa kissing) for being so utterly inane and having nothing in the way of suprises or sudden insights.