The people that answer the survey for BLM are largely the people that love BLM, which you can see in its bar graph. Is there even a single other Job with that curve?

Originally Posted by
ty_taurus
BLM

Conversely, SMN's...

Originally Posted by
ty_taurus
SMN

...has a lot of people that dislike it (the 1s and 3s), but also has 10s at both 5 and 8, and 9 responses of 9 (again, looking at overall enjoyment). This implies a cadre of people that REALLY hate it, but then a good deal of people that are neutral towards it and that like it. And notice SMN has 133 responses (as of right now) vs 86 for BLM, which is 50% more than BLM (or BLM having about 1/3rd less than SMN, if you want to look at it from that side of the coin).
I think the way to see this is what you say in your first paragraph - that people who love what BLM offers play BLM and love BLM, and people who do not, do not play it. For most other Jobs, it's not quite as clear, so you have a lot of people pick them up and then get disappointed in the results later. For example, some people pick up CNJ and enjoy the nature themed elemental spells, then become disappointed when they get to ShB/EW WHM and no longer have those.
The single worst case of this, though, is SMN, since you have the people who HAD a Job they liked lose it, and who are very vocal with their disdain. It would be interesting if the SMN page had a question for people who loved old SMN vs those who did not and see if there's a difference in how the two groups view new SMN. What is telling to me is that only 12% say they picked up SMN in EW, but 22% say they like the EW iteration the best. Meaning there were some people who played old SMN who enjoy new SMN better. Further, a bit over 20% recommend no change at all to the Job with a further 23% wanting only a minor rework. That doesn't exactly speak to high levels of dissatisfaction on par with the number of people who say the Job is unfun to them. The implication being that around 45% either like the Job or are fine/okay/neutral with it. It's just the ones who hate it REALLY hate it.