Simple question, what makes a fight enjoyable for you?
Lei shen Hc epitomizes a great boss fight for me because you almost get to use all of your class abilities.
You need aoe stuns for ball lightnings, you need single target stuns, knockbacks and slows for diffused lightnings. You need movement spells for helm of command. You need personal or raidwide cds for static shock. You need to stack, you need to spread and good positioning in general. You can also customize the fight by overloading different pillars which will change the fight drastically.
So what makes a fight enjoyable for you?