IMO:

FFX: Sucks, sucks, sucks, sucks, sucks, sucks so much!
FFX-2: *Please see FFX*
AC: Fantastic! Though, I really hate when they made a lot of sequels.

As you can see FFX and FFX-2 is my least favourite FF. In the list of my favourite FF, FFX and FFX-2 was listed as the worst. I wish Xurts is here.
(In order from favourite to the least favourite)
FFVII
FFIX
FFVI
FFIV
FFT
FFXII
FFV
FFX-2
FFX

Just because I hate FFX (And X-2), that doesn't mean it's very stupid. It's a good game.