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So their peer review process is not great and easy to game with a "fasttrack" approach to publication that makes me suspect commercial aspects are more important than scientific. They are a Swiss owned publisher with a knock 'em out quick and in bulk business model.
Researchers accuse Frontiers of questionable editorial practices, which include publishing articles without scientific validity, just to make profits.
www.swissinfo.ch
This is a good overall summary. Mentions that it is not easy to reject a paper from Frontiers.
This paper has been withdrawn it must be said.
Their fees to publish seem suspiciously low as well....... They will be having serious reputational issues I think, as that is very important int he academic world. Your journal lacks credibility the best will publish elsewhere.