I can see why some don't like it. The character's didn't have much depth, and the characters are really what make a good game. Lets take a look at the characters again;

Zidane - an obnoxious monkey boy who wants to get in Garnet's panties. Great role model that.

Vivi - Compulsive depressive little boy, I'm suprised he didn't commit suicide by the end of the game.

Steiner - OK, he wants to protect Garnet. Does he even have a personality of his own!?

Freya - What is the point of her? I found Sir Fratley more interesting, and he only appeared in the game for a few minutes.

Garnet - Eye candy. Other than that, bland character.

Quina - Big fat retard.

Eiko - Probably the best character.

Amarant - Sent as a bounty hunter, can't even remember why he joins the team, can't say I really care either. Pointless character.

The best characters are the ones that aren't in it much, such as Beatrix, Lani, Tantalus.