It's extreme, but, it's required for progression (to what many say is easier "extreme" content)...... that is a bit of a problem.
If a developer wants to put stuff with unforgiveable mechanics in, but make it brick wall content, I say that's fine. By brick wall, I mean that you get a title or minion or mount or something otherwise inconsequental for defeating it. I have no problem with that, and I bet others wouldn't either.
To put really difficult stuff out there, and then require people to beat it in order to view other storyline elements, is kind of ridiculous.
The brutal mode stuff that is coming up, I have no intentions of being able to defeat it. I'll probably give it a few tries when I'm bored, but, I will expect to fail. I'm not going to complain about that content, because, defeating it isn't required to progess towards additional content. I won't feel like I'm missing anything as I wipe over and over to it.
Titan EX is (at least it was) required to progess on to Ifrit/Moogle/Leviathian, that's kind of a problem. What happens is that you get a percentage of the playerbase that grinds away at the content, defeats it, and then never wants to run it again. That leaves another percentage of the population in the dust and a lot of people just end up quiting because they get the feeling they will never catch up. (I'm not quiting, but others in my FC have because they felt like they would never be able to find a static to progress through T5... let alone T6+)
Before I get completely flamed with QQ garbage... I'm really not trying to boo hoo hoo cry about this, just pointing out what I'm seeing on my server with my friends.
Personally, I'm a very patient person. I know that there is always something else in game that I could be doing. There's leves to be run, dailies to be done, roulettes to undertake, sub-classes to level up (I started after 2.1)... a lot of people don't have my level of patience though.
They see a "beat this in order to progess to the next big thing" sign and they fail 50 times (doing the same thing over and over) and say something along the lines of, "eff it I hate watching other people screw up, this is boring" and leave.
It's just poor game design on the part of SE to make something so difficult for such a large percentage of the server required for progression. And to make it the same scripted battle over and over again... it's just yuck.