Well, if we intend "who can unleash most damage in shorter amount of time" - also called Burst/Nova/Spike damage - BLM seems to be the best. But it's because you see the big number showing every 2 sec of casting, or such. As a BRD, with a nice crit progression, an optimal use of barrage - everybody hate that skill, but is useful for burst damage - and the right setup, i've hit a media of 360ish + 3x180ish + 160ish + 3x180ish + 150ish = 1.7k damage in about 5-6 second, between the critical autoattack x3 and straight shot / venomous bite / windbite progression. After that, every hit was on the 200 / 500 damages, between critical or not. So i can assume we are a nice DPS class. Dunno if the best, but i can say we are able to burst too, even if in a particular way.