This game is very frustrating. Every time I find something good about it, I find something bad that frustrates the bajeebas out of me.
Take the Crystarium. I like the change from FFX's Sphere Grid by making it multi-job. Making stats availible across all jobs could add a lot of balancing potential. Level up one job in particular to reach a particular useful ability? Or level them all up equally in order to create a character who can perform better in more situations?
Then, the negative hits. In this case, the progression. Why do we only get access to tiny portions at a time? To stop grinders? What is the point of that? If people like to grind, let them grind. All they are doing here is preventing people from planning out how things are going to go and upsetting the people who just like to go for the high level stuff. It serves no purpose. At least with the Sphere Grid locks, you would get a couple keys early on and had to figure out which characters you wanted to advance first. This just cripples the rate at which you advance, for no good reason.
Which ties into what is currently my single biggest gripe with the game: The pacing is terrible. There is a lot of awesomeness here, but it comes sooooo slowly. Whoever designed the pacing for this game needs to lose their job. Don't dictate progression, leave it to the players! It worked in every other FF for a reason!