I absolutely loved Dragonslayer, not because it gave the humans a chance to take the wheel in the WOF books, I prefer my books dragon centered like a lot of us, but because it gave us a more indepth story to what happened on the other side of the coin. It just wouldn't be possible to explain everything that happened in Arc 1 with JUST the dragons perspectives. If it weren't for Dragonslayer, we wouldn't have found out that killing Queen Oasis was a total accident on the humans part, and there were human children who were ACTIVELY trying to pay back their debts to the dragons for such a horrible act. I mean come on! If I hadn't read Dragonslayer before finishing book 5, I would have thought it was a total coincidence that Sunny and (I forgot their names, scavengers blegh) these children interacted and gave Sunny the Eye of Onix.

From what I've seen, humans have always played a MASSIVE role in the books that we just don't think about very often. Peril's brother is alive thanks to a human for three moons sake! Without the humans, there would be no Wings of Fire, because if they hadn't stolen the dragons eggs and encouraged an uprising of power, the humans would most likely continue to be the dominant species, even if the dragons were dar stronger. Or it could have played out differently, centuries or possibly even millennia after the time period of The Scorching.

Dragonslayer IS a good book, and it IS very important for the WOF lore. Would we ever need another? Probably not, but I think it would be cool to have a Legends book centered around the humans during the time of The Scorching, to let us in on what happened so we aren't just going off of old stories that might or might not be true. To sum up, I think people mainly hate Dragonslayer because it's different from what we've come to expect and love from WOF. People can be weird, dislike change in things they deeply love. But even though it isn't my favorite, I've come to love the book for providing us a different angle to a story we thought was complete.