I'm in a "wait and see" mode before I judge how it plays and what content there ends up being for it before I judge.
But all those kicking off about "limited jobs can't do this and they can't do that" well what about those who wanted something different? Who wanted a Blue Mage that was not bound to the limitations of this game's job system? Those who'd get plenty of enjoyment out of this concept? From a personal level I applaud that SE is tried to add content that isn't limited to this game's usual formula, it's just unfortunate that they're not always good at it, hence my current skepticism, but I like the concept and I can see how it could be made fun and how a limited job system could be used to add a different experience to the game. In fact, if they managed to make Blue Mage enjoyable and if it is something I can get invested in then I for one would not want it to be a normal job, unless it's a normal job version of it.
However, I look at the limited job from a different perspective. This is a potential solution to some of the problems SE have ahead of them. How can SE implement the vast plethera of jobs people want from the variety of Final Fantasy jobs that are out there, keep their identity and keep content balanced? I expect with the number of existing jobs it is getting challenging to balance them all whilst keeping their identity. There is perhaps a reason why this style of MMO doesn't get a massive range of jobs/classes, because balance is not a simple affair, especially when the content needs it to be. There is the option of adding content that doesn't require that kind balance, which it seems they're testing the waters with on Blue Mage. So 1) I hope that it is good and 2) I hope that people end up liking it because if SE end up investing in alternative battle content that strays from how the rest of the game works, ultimately we win in the sense we get more variety.
But at the moment, we can only speculate its potential to be good or its potential to be bad. I'd not naysay it just yet, even with the restrictions. Whilst it is out next week, I'm going to reserve my full judgment until 5.0 is out, but at least we'll have a reasonably good idea of its direction this patch. I get people might want to do story with it, but SE likes to make some elements of the story have a certain challenge level and if BLU is OP by normal job standards, it'd remove some of that, which could be their logic.