Zidane: That's a big QFT Void. Squaresoft is responsible for the RPG giant known as Final Fantasy and Enix is responsible for FF's (before the merge)rival series Star Ocean, they combined forces around the FFX-2 period, and are now known as Square Enix.
Are you disagreeing with me or are you agreeing with me? That "QFT" is always an ambiguous statement, and by the looks of it you're disagreeing so...

They're still a business and the divisions are still the same. The Enix people didn't suddenly come in and start working on the Squaresoft games and the Squaresoft people suddenly came over and worked on the Enix games, both companies have different development departments and while they are all the same company now, each division has its own duties. The blame (or praise) for FFX-2 falls solely on Squaresoft's shoulders, as it was their division that made it.

Aside from the afforementioned fact that Enix is responsible for Dragon Quest, which consistently outsells Final Fantasy in Japan by a large margin.