I'm glad that you and other people found some value in it. When I saw it here, I was worried the comments would tear it to shreds. :)
It was just a bit of a shock when I clicked the link. Since the link title was slightly different than what I named my slides, I just thought, "oh hey, another zsh comparison, let's see what this guy/gal said"...
Mostly, when submitting a post I refrain from changing the original title but I thought "How zsh is more useful than bash" would be better than the original. BTW I'd probably feel the same way too but the deck seems to be well received