What did fans think about the Kazon arc at the time? Was it unpopular? If so, is it still unpopular? If that's the case, then I am in the minority on this one.
From what I've gathered from forums, the arc was very unpopular** (oops, originally wrote popular but meant unpopular lol). Michael Piller defended the Kazon and the Kazon arc (and it was really his baby) but the other writers didn't like it and he said in one interview that even many of his friends said they didn't like it.
Looking back, I think the Kazon episodes are actually some of the strongest of those first couple of seasons and I appreciated it as Voyager's only real attempt at a proper arc but the fact that Voyager still maintained its high warp ability but kept bumping into the same ones just irks me. They should have given some reason for it.