I will say one thing, while it's not as good as MoR, its plot moves much faster, which helps compensate. I think Alicorn also handles the emotional stuff better than Eliezer (unsurprisingly); I felt far less cynical and contemptuous than I might've.

On the other hand, Eliezer is much better at lacing in the didacticism since it feels like the lessons has for the reader are abandoned toward the end of book 1; and there isn't much one could learn from book 2 with Elspeth.

I particularly loved the writing for Allirea; not so much an interesting character but reflected very nicely.

In some respects I am disappointed by characters' thinking & planning. They seem very... humdrum, straightforward, and locked into magical thinking. This could be explained in some cases, but not all. Very rarely did I find myself thinking, 'ah, clever!' or 'oh, they're right, that wouldn't work'.

I came into Luminosity expecting Bella to sort of be like Harry in MoR; but she's not very much like him. Harry with Bella's advantages and obstacles would have taken over the world in the first few years. Bella is running and hiding as a data entry clerk? I mean, I may be echoing some comments I saw go by in the comments feed, but I feel the Volturi are just not much of an obstacle.

Vampires die easily of fire? Splendid, Bella spends a few months reading and developing a fuel-air bomb and there they go. (Easily justifiable, too, consequentially.) Or steals a nuke. Or maybe she has the Cullens buy up some hospices and builds a newborn army while they develop a more-fun turning process which could be mass deployed. Or something! (Creating some werewolf packs was a remarkably stupid thing to do, even if we largely go along with Bella's analysis. And if we judge by the consequences, even more stupid.)