Sorry Enterprise or it's mirror version never sold me enough to buy their novels. Too many novels about DS9 and TNG, the franchises I did like, I haven't read yet before I'd even consider it.
As for the episode? Everyone's stupid in this one. Let's just get that out of the way. But it's a mirror universe episode, so that's par for the course. Random dying, lots of sex and everyone's evil. It's the whole concept.
It's entertaining enough and some of the small changes are interesting. Like how Porthos is a huge badass dog now, how Phlox has evil creatures that look like they'd rip you to shreds, things like that. I just took it as two hours of entertainment. Not the best Ent episode... definitely not in the top tier of Trek... but amusing in it's own right.