Having said that, I ran a number of instances on my MRD this weekend without a hitch. I asked, each time "Anything in this fight I need to worry about?" and if there was, they told me. After awhile I started asking "So everyone know how to do this fight?" and if they did, great. And if not, I told them what to look out for. Did this in Satasha and Copperbell on the final bosses, and I'm happy to say I never had to deal with more than one add in Satasha and nothing out of the ordinary in Copperbell.
I actually thought the game itself did a pretty good job explaining the fight mechanics for those bosses that actually had mechanics you needed to care about.
The Copperbell final boss was the only one my group tripped over a little, but we figured it out without wiping. By the end of the fight we were coordinating our individual jobs pretty well... I believe the MRD tank was holding the boss(es), the CNJ was healing, the LNC would grab and position the bombs, and I (PGL) would take out the spriggans that went after the bombs. And we just kind of worked it out as we went through the fight. No problem.
I was actually quite pleased with that fight. I'm hoping for even more complex mechanics in future encounters, and I'm glad the game eases people into them.