Should I finish these?

Inspired partially by sophia_sol (but I might have done this anyway), I'm incorporating a very liberal attitude towards not finishing my Hugo reading.

The Kaiju Preservation Society (Scalzi) - DNF. I'm not actually asking about this one as I've decided I'm not going to finish this. It's not bad, it's light and frothy and fun, but I think I am willing to deal with light and frothy and fun when it's tropes I'm interested in (galactic empires in The Last Emperox) and not when it's not (kaiju).

The Daughter of Doctor Moreau (Moreno-Garcia) - Is there a payoff here for someone who hasn't read Island of Doctor Moreau? I didn't dislike it and am willing to read more if there is a payoff, but I'm worried that it will only be a payoff if you know something about the original. Also, independently of this book, should I read Island? (That is to say, I wouldn't read it just to read Daughter, but if I read it I might read Daughter afterwards.)

A Mirror Mended (Harrow) - is this worth finishing? I read and liked the first of these but I guess I'm not super convinced there's enough more to say in this multiverse... is there? I got far enough in this one to be aware of what the gimmick is likely to be, but I also think I am near saturation on reversed fairy tales. Tanith Lee probably did it better anyway