What has been said. You will be able to climb floors being BLM not because the job is particularly useful there by any means, but rather because with a half decent group Nyzul is pretty easy. Nyzul works the best usually with setups similars to those used in exp parties (Healer, BRD, THF, 3 DD, or two healers and no bard, or brd + cor + 2 dds etc). Of course BLM can help sleeping mobs, nuke some slimes, pull, start getting to the rune while others finish, get a lamp surrounded by 5 aggressive mobs... but the point is any of the other jobs (THF mostly if farming run only) will be far more useful to be able to kill whatever the random factors throws you.
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