So this, my final book and final step in my "Creepers" journey...
"Mirror, Mirror" was not my favorite of them, but it was far from my least favorite. It had a decent structure at least, and an interesting story. And it was nice to have a good female protagonist (when the protagonist was finally chosen).
Of the five books I read on my Creepers journey, this would be in the 3rd position, but in fairness, the 3rd position is quite a bit better than my bottom two, "The Gravedigger" and especially "Doctor Death".
All in all, as Goosebumps knockoffs, these aren't the best out there, but they're not bad (well, two of the five I read were pretty bad). But I do think many kids will like them as they are waiting for the next better written spooky story.
I have to admit, reading these books was a fun way to spend a few nights.