What are the issues that Final Fantasy fans have with Final Fantasy 12?

Just curious because while I greatly enjoy playing the game for its battle mechanics, (e.g Gambit system) I sometimes hear how fans of the series have a huge problem with the sort of main character Vaan.

But then that got me wondering just what is wrong with the writing structure of the game as for me personally, I enjoy Vaan for two reasons as one is because he is useful in battle as a wizard, and secondly because of the “BASCH LIVES” moment that happens in the game.

My point is that while there are some aspects of Vaan that I do enjoy, I wanted to see if I could get a better understanding of what made the game infamous when it originally came out on PS2 as I simply wanted to understand why the game had gotten a bit of flack again when it was originally released.