As long as the criticism is productive, then I would think so. Too many times we Christians think we can't learn anything from an unbeliever. But, sometimes, the non-Christian may be more moral than we are. As long as I felt that someone was genuinely trying to help me, I think it would be healthy to listen. Who is to say that God cannot speak through any source?
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I might have decided, or maybe not, that I should or shouldn't, depending on the issue or non-issue, to possibly share or not share, any thoughts, opinions, or facts (that might not be deemed factual by some), due to possible fear of any misinterpretation or retribution.