Hidden Mist doesn't take much effort, nor time to establish however.Yeah but in a mid-close range fight, Zabuza has less changes to dodge Mei's huge AoE attacks to safely put up the mist. Mei's advantage with long range attacks gets nullified if she can't pick where to attack.
What really bugs me is the possible overrating, and potential giving of fake feats to Mei's Acidic Mist, such as: She can lower the PH level, beyond that of which she'd shown.
Of course, it's obvious she can higher the PH level that's not in question, seeing as she's done it before, as well heightening the PH level more or less makes it into another form of the Hidden Mist technique without the hidden aspect.
Also, the corrosiveness of Mei's Acidic Mist is indeed potent, but not in the sense of immediate death, as some may believe or have preached.
Mei's Acidic Mist corroded Sasuke ribcage Susano'o to the point, that it was capable enough to slip through a small crevice (yes, a small hole that the mist corroded, if this weren't the case, Sasuke entire body would have been subjected to corrosion at the same time. Meaning, that Susano'o wasn't dimming the corrosion potency/rate in any possible way), and began the process of corrosion upon his flesh.
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The corrosion albeit quick, did not do as much damage as it would need to do to halt someone with high pain tolerance, and on the verge, of killing Mei. This being Zabuza.
Sasuke panicked at the initial introduction of Acidic Mist - Flesh, but then leveled himself, enduring the pain before Zetsu interfered.
Zabuza's pain tolerance is/was a lot higher than Sasuke's at the time, (Sasuke getting his chest blown out isn't a pain tolerance feat fyi, he basically died on the spot if not for the help of Jugo's compatibility resuscitation) being able to take multiple stab wounds that would kill on contact even high tier ninja.
Just take a second, and admire badassery that is Zabuza, as well, as his pain tolerance, and will power to behead Gato with a Kunai, even through all of those fatal assaults.
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On that note, I believe I've made my point clear.