boss fight

(This is not Kickstarter demo-related) I engaged a veteran shooter gamer to discuss boss/raid encounters and how the fundamental choices Ember has made would bring a very different experience. I brought up how things would play out, and probed for what ways the player would react in terms of...

What bosses do you like and what do you like about them? Do you like the boss abilities, tankyness, the 1 hit moves, the mobs, terrain, large squads, support aid, buffs/debuffs...? Etc Drop in some ideas of what will make a good boss fight for Ember? ^.^ Ps. Leeeeroooooyyy jeennkinsss ^.^