I wouldn't call it quantity over quality. One game every 2 years isn't a lot. I've kept up with FF games religiously, and I can say for a fact that their quality is always top-level
In all honestly I agree. I've found the more recent games to be pretty good overall. In fact, my biggest complaint (that the main character was terrible in X and should have been Ashe or Balthier in XII) went away with XIII so perhaps they're even improving.