Guild Wars 2

Ok, simple thought: Make all monster in the dungeon easier much easier.
Say remove all silver circles. Remove the one hit kill attacks from bosses, etc.

And remove all the waypoints!

I played other MMOs before and I was never so frustrated with raid content before. You see if this is all on an interesting difficult level but a party wipe means restart the dungeon. There is suspension. Will we make it to the end?

If you just make every encounter frustratingly hard and have a waypoint just around the corner. Well, you die and revive until the encounter is solved, and if your gear get’s broken, you just teleport to the start and repair. There is no suspension, this is just boring.

So my suggestion, tune the difficulty down, and make party wipes possible. There you have your hard content the only a coordinated party can master, but it would be much more interesting and not so frustrating.