It doesn’t matter if the book is created by KDP Print or not. If the book is amateurish and poorly constructed, it’s going to get bad reviews. If it’s a quality book, then people won’t even notice, it’ll just be the way that it is. Unless you smack people in the face with the “this book is self-published!” dogma, most people won’t even know (or care) if a book was printed by KDP Print or somewhere else.
Exceptions might be for specialty books (such as full color photo books – with which I don’t have any experience yet) that may or may not print as well, but for standard black & white trade paperbacks, people won’t know or care where it was printed as long as it is easy to read and doesn’t fall apart.