Dear Mr Beall,
I have once submitted to the journal of US China medical Science, and it is not true that they do not review the articles, as my article was peer reviewed and I was asked to revise the artcle.
The comments are reasonably sound, and in my opinions, the suggestions improved my article.
So, I think that it is not fair to give a judgement, when you do not know exactly what happens.
Indeed they charge 400 USD, but I think it is reasonable, as they sent me the print issue that contains my article.
Further, some articles in open access journal may be of no value, but we as scientist can critically review each article that we will cite. Using valuable open access articles that pass our critical review is an advantage for us, as we do not have to pay.
Therefore, I will not avoid open access publisher, even that they are predatory. We can judge their articles, whether the articles are valuable to be cited or not. If it is valuable, why not?