Nomura gets a lot of undue hate I think (and a lot of due hate). I don't like a lot of his KH stuff, but his overall portfolio shows a lot of range and a great eye for individual characterization. People point to Tidus and say "lol androgynous" but ignore Auron, who, aside from being fucking kickass, is an awesome design. I think that Nomura's designs for the lead character are unfortunately affected by marketing.
It's true in a lot of Japanese games too. Vaan is a textbook example, as are Ashe and Basch. Both were made more palatable to the average Japanese consumer from Yoshida's original designs.
His monster designs are great, and his FFVII and VIII designs are part of the reason Final Fantasy became huge in America. I like his X designs-- I think they fit the world that the game takes place in. I think Tidus' design fits his character, too-- like him or hate him.