With MoP pretty much over, I'm very much curious about which fights from MoP they liked the most?
Whether you like the boss for the fun aspect or challenging is solely up to you!
Personally I liked Lei Shen a lot. Personal responsibility, teamwork and very finely tuned. Siegecrafter was a very fun and challenging fight.
EDIT: Poll added aaaand I forgot to add "Other" as option, apologies.