Speaking from experience, I find the dungeons here are not necessarily hard, but not really easy either. You have to know the fights and pay attention to boss mechanics.
It's quite different from other MMOs, where as a DPS, I just follow the tank, kill mobs and not stand in any bad stuff.
Here, it's like, "Kill the adds quick!", or "Don't kill the adds.", or "Draw the adds to the boss." or "Kill the bird for the shield but don't click the shield too early." or "Stand in the circles when they light up all around the room. Quickly!" Do all of the above while dodging AOE and various bad stuff on the ground. Messing up on anything at all will kill you instantly. (That's not an exaggeration.)
I often wonder if veterans of this game realize that not many MMOs in the West are made like FFXIV anymore. And that's a good thing! But it probably accounts for some of the bad play you might be seeing.
Just food for thought. :-)