It's fine if you want to write pulpy, low-brow stories but you can't really begrudge people critiquing your work. The type of people who are into these stories generally aren't the ones downloading self-published sci-fi books off the internet. Author's voice is indeed very important but don't forget about tone and mood. Is the whole book as silly as "pie pants"? If so, great. Some will like that, others won't. But if the story is fairly straightforward and all of a sudden theres a sentient apple pie you're gonna give your readers whiplash.