I agree that Miri was op in OS. Comparing equivalent gear, Miri still had significant advantages in OS. Flamebreath regen in between mobs increases her dps relative to classes that do not benefit from the time in between mobs. Being able to use dragon trans to boost her survivability and dps toward the end of a match dramatically reduced the effectiveness of statues thrown in the last minute or two (which was how most strategic matches were decided). On top of that, the wide hitboxes and high damage multipliers of chainswings easily made it one of the best non-sp attacks for clearing statues.