Indeed, it's a quite important revelation that he was once human. It also confirms that he has a deeper backstory (might be some somewhat tragic parts in the manga depending on the tone Matsui wants to give it).
Other than that a nice funny chapter like usual, I think it's really refreshing to have this sort of manga in Jump, and Matsui's bizarre style always gives interesting atmospheres. I wonder how fast woud Korosensei be at the videogame Kanzaki was playing? He would probably lose to her since the computer wouldn’t be able to keep up with his moves

. The bath part was funny too, when he gets out of the bath and his mucus stays with him, but why couldn't we see him naked !?
I agree with Teeba I was imagining a much less deeper voice for Korosensei.
About the popularity and advertising stuff (haven’t been here in a while so I’m only comenting it now) I like how the manga is popular but of course it’s a bit forced and I think exagerated for a new series, which hasn’t had enough time to seriously deserve that much atention (as much as I like the manga). But that was to be expected anyway, with ToC rankings that good, so it didn’t really come as a surprise to me. Also, I don’t think it can reach Naruto-level popularity or anything, but I also don’t think the hype will go down or the quality suffer so my guess is it will be very popular, just not as much as those huge hits. But you never know, I also would never have imagined it would be this popular already when it started (even if I thought it was going to be quite popular) but look at it now. Anyway I don’t think it will affect Matsui and if it lives up to it’s popularity I don’t mind it at all

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