The only hard thing about Titan is how much you depend upon other people to do what they're supposed to be doing. In all the dungeons before Titan and the primals before him as well, if people are playing sloppy, dieing, etc., it's not a wipe. You can generally recover easily enough, and you never feel like the mistakes made were because the fight was too tough or anything. You just felt like "well, we messed up there, we don't do that again" and move on to win.

When I fought Titan and won, I didn't do anything differently than when I fought him and lost. The difference is that the people I was relying on for the group effort did what they are supposed to. It's not a "hard" fight by the sense of traditional difficulty (though it certainly is quite a few steps above everything that had come before), but the punishment for making a mistake is vastly disproportionate to the rest of the game. I know latency is a factor for some people, but the fight is what it is.