Acid Cloud sucks because, as others said, its damage is too low for higher MP's. It only does 150% damage, compared to Bears' 236% or Bats' 500+%.
At low MP's it's the best though, because you can just run around 1-shotting things with it. However, nobody does low MP's anymore, really...with the neph valor changes, high MP's are faster exp, and higher magic find/bonus item, so there's no incentive to do lower MP's unless you have bad gear.
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