One complaint I do have is that some of the sonee-related sections start to verge on being torture porn. It feels excessive is all. That's my only gripe thus far but its weirdly prevalent. If that could be buffered out than I think the story would be near perfect for sure.
Yikes. I never knew that stuff existed until now, and I think I'd be better off not knowing it existed.
That said, here's my answer to both of these questions. The reason Sonees and Roseys disgust me so much is that they're basically everything a child, or a baby animal, should not be. Everything about them - their appearance, their speech, their behavior - is just creepy and wrong, and the fact that Chris created them only serves to amplify the sheer repulsiveness I feel towards them. Then there's the interpretation that the Sonichu children are Chris's projections of what he believes to be aspects of his own life - himself as Robbie/Robee, Cera as Sarah Hammer, and Christine as Crystal. Sure, it's reading too deeply into this whole thing, but at the same time, it's an interesting concept. Ultimately, though, it's the blatant creepiness of them that gets to me, not the annoyance. That's what led me to turn them into the horrific abominations seen in CWCollateral - the potential was always there, it just needed to be unleashed.
The thing is, I believe that if someone's going to write something like that, they need to make the victims pretty damn deserving of their fate. Otherwise, it's just gratuitous, unsatisfying, excessive, and disgusting. For what it's worth, I tried my hardest to make Sonees and Roseys into some of the most vile, loathsome little creatures that I could in order to justify the PVCC's extermination campaign, and from the reactions I've seen out of CWCollateral's fanbase, it worked. If the story was nothing but nonstop torture and murder, it would get tiresome after a while. Hell, even Operation Hedgeclipper can be viewed as important to the plot, both as a political assassination of Sonichu's family and as a blow to morale for the chu population of CWCville. That's why I like focusing on the PVCC vs. Chris plotline first and foremost - it presents a reason for the carnage, especially given all that the Jerkops have suffered at the hands of Chris and his creations.
TL;DR - If you're gonna write about torturing and murdering Smurfs, ponies, Sonees and Roseys...anything, really...make sure you have a damn good reason for it, and that you at least try to justify it. Otherwise, it's not much more than death for death's sake. That's my two cents on the matter - take 'em or leave 'em.