/BLM is honestly barely giving you anything but Conserve MP. Almost nothing else. That's barely even a subjob. You might as well just be WHM 75 with no subjob, the difference is THAT huge. I really think that if you intend on playing WHM a fair amount, then you need to level it. If you don't plan on really doing much, healing for some random events for a social shell, raising people or the odd PLing session, then okay.
If you really intend to do anything else with the job, you should level SCH to 37. It is just as bad as a NIN without /WAR, a RDM without /BLM and /WHM, it's just unbelievably beneficial. It was designed by Square with WHM completely in mind, and as a subjob, it fits like a glove.
I really wouldn't even think of it as like, oh the mean forum guys are so judgmental that they are forcing me to level it. If you level it, you will be the one who benefits, not us. And believe me, you will be extremely happy with it if you devote the time necessary to get over the learning curve and macro adjustments that are necessary to use the new stuff you get. It's like night and day. And really, it makes the job 10x as fun for me.
Though this is not to discourage those subjobs, because by no means are they bad subs
Personally, I've always thought /BLM was a terrible sub and have always discouraged it. It barely even qualifies as a subjob for WHM, you get a job trait and that's about it. I was always /SMN before SCH was available. Auto-Refresh was always better. Having Repose put the final nail in the coffin of /BLM forever for me. Edited, Jul 8th 2009 2:17pm by JingWoo