Kissing Midnight, like all of author Emma Holly's recent paranormals is firmly on the erotic side of PNR moreso than Holly's earlier Midnight series (Catching Midnight, Hunting Midnight, Courting Midnight ).
So, as you can garner from the mixed reviews, whether you will enjoy Kissing Midnight largely depends on whether you like a bit of sex with your story or a bit of story with your sex. Kissing Midnight falls in the later category and provides sensual parity for pretty much all of its characters: leading man wolfshifting upyr Edmund, his love Estelle, all Edmund's adopted children - and all the vamp background characters except poor Robin (Edmund's biological son) who is the only one going through a dry spell. Even though there are hints of nautiness (foster - so not actual - siblings do the taboo), for Holly the sensuality level (as opposed to the sensual density) is a degree or two milder than her last couple of erotic paranormals, all menage or BDSM (except for one light bondage scene) or MM is offscreen. Most of the couplings are intense and frantic, but Holly varies her sensual language so that even with the large number of love/lust scenes they don't end up feeling repetitous.
My reading tastes generally fall more on the steamy side of mainstream than the erotic, but while I would have preferred a bit more story, I did really like wolf-shifting upyr Edmund - you'll remember him and few other characters from the earlier Midnight books. Edmund is centuries old and very sweet and vulnerable in his love and protectiveness for his adopted human family and in his persuit of the young woman Estelle who has called to his heart since he first met her as teen. While Estelle has lived with Edmund's family after the death of her parents, Edmund doesn't pursue Estelle until she is of age and out of his house, so unlike some other readers this didn't bother me. Let's face it if you actually stop suspending disbelief, a relationship with someone older than your great-grandparents is squicky whether you be 15, or 50, so I try not to let in too much reality when I read vamp romances.
The story itself is very simple, some power hungry vamps are using one of Edmund's foster sons to manipulate Edmund into taking out his vampire queen former lover. But despite the simplicity I liked the build up of all the conflict, the (for Edmund) frightening transition and the cliff hanger ending enough that I might consider reading the next book- although I strongly suspect that with the way things end for Edmund the next book may be up outside of my sensuality comfort zone, so I will likely prescreen it before deciding. The trilogy continues in Breaking Midnight and completes with Saving Midnight).