These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Alternate Character Interpretation: Arguably, Grace and Sam are Supporting Protagonists. They spend most of each book ignoring their problems. Most of the major conflicts in the series thus far are resolved by others, most notably Isabel. In Shiver, she comes up with the idea to cure lycanthropy. In Linger, she's instrumental in helping Cole find eventual redemption by saving Grace's life.
Cursed with Awesome: Although turning into a Wolf is portrayed as a negative thing in the series it does have its advantages at times. Cole definitely sees it that way. Grace even admits she will miss some part of being a wolf at the end of Forever.
Moral Event Horizon: Sam's parents slashed his wrists in the bathtub in hopes of killing him since he couldn't control being a werewolf.
Tear Jerker: Near the end of Shiver, when Sam gets turned back into a wolf. This male troper admits he sobbed for pretty much the rest of the book. Sure, he gets better, but...