I don't care what people are saying about me, good or bad, in blogs or on Twitter or in the media. There will always be people who don't like you and don't like your books. Ignore them.
Writers aren't in competition with one another. It isn't a zero sum game. If you have a good book, a good cover, a good product description, and a low price, you can sell well.
Publishers vet books, and they do a good job keeping out the low quality. But they also miss some good quality.