Top 1 on Crystal has over 1000 wins accrued... top 2 is only behind by about 400 points as of this morning and has under 300 wins. I'm pretty sure that's some kind of record for slowest climb.
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A good BLM is, well, very good. But it's one of the most skill-demanding classes and it's not one I would generally recommend. It's a class that's vulnerable to being focused down, and it might as well not even exist on the Volcano map until you get LB for instant casting (people please stop using BLM when Volcano is on rotation.)
I'd still rather see a RDM just rolling their face on the keyboard than a BLM. RDM is really hard to screw up and linear Bind or Silence is incredibly strong, along with LB being good damage on the primary target.
BLM is definitely in the "good in theory, if you have a team that actually coordinates" bucket, along with DNC, GNB, and RPR.