On dummies, blm>smn>rdm. Is up to the player and the encounter to hold his/her own. There are better and worst suited fights and players that make the best of the encounter while some who dont.

Sometimes on Susano i have saw blms dealing more damage than sam and rdm but depends on the skill on the player and on that case a bit of luck at not being targeted by too many Susano mechanics, but Susano es a heavy movement fight is logical blms will struggle there, if they didnt they would be crazy on less movement ones

Things wont change aside very small changes, and some people make it looks like the sky is falling on the poor blm