The obvious exceptions to this are 10 and 10-2, which shouldn't even be considered FFs because they are a disgrace to the series.
I disagree.
I thought Final Fantasy X was a GREAT game!!!
Of course it's not as good as Final Fantasy VIII, but I think you're going too far saying FFX and FFX-2 were a disgrace to the series. I admit FFX-2 wasn't that great, but it wasn't a disgrace.