[Discussion] How do you define a fun boss fight?

[Marxam]

1. Relevant, emotionally charged music
2. Boss that give you that "oh shit, here we go" feeling
3. The sense of struggle with your party as you overcome the boss through tactical and sometimes clinch actions.

These are qualities of a great boss fight.

In regards to the Titan X fight, the only thing going for it now is the music.
The feeling I get (as a tank) is "I hope the other players know how to move cuz this is starting to piss me off"
The only struggle you and your party will get is lag and the unfair advantage it gives titan in his OHKO moves

P.S. The first and only boss to give me that impression (I've been gaming since '97) was the Tower Knight in Demon Souls.