what would you consider hard content?

[Kasathar]

Team-work is one of those things I don't really see as much in this game and probably the most challenging content I still have yet to see delivered in a well executed manner. Yes, we need a "group of people" to beat a boss/dungeon/raid, but I rarely feel part of a team.
Most of the fights in this game are just a big middle finger to newbies and vets alike due to the randomness and execution of certain scenarios.

The only fights I really feel like everyone needs team coordination and skill are Ultima's ballad and Garuda EX. The rest are either a tank and spank free for all, cheap 1 shot boss moves or a fight against your own connection speed.

EDIT: I forgot to add another great example of team work: T1's Caduceus. Yeah, for many, this fight is like taking a candy from a baby, but if you bring any hardcore raiders from any other MMO out there they will cry at how much coordination is required (it was even better when the slimes were required to be fed to Caduceus)
My wife doesn't play the game much anymore but she did tell me that thanks to certain fights and scenarios she feels as a superior player in many other single player and MMos alike.