I would say VIII.

It is one of my least liked FFs, but then again, I like most other FFs so much that they don't qualify as average. And I still like VIII more than loads of non-FF games.

Another thing that is average about it, imo, is that it was about averagely popular for a FF. It's less well known than FFVII or FFX, but more than FFIX for instance, and some of the older ones.