You've might already noticed.
http://www.sciencemag.org/content/342/6154/60.fullInteresting article from Science about the new boom of low-level journals, most of which are OA. Despite the clear disclaimer at the end ("everyone agrees that open-access is a good thing"), the article's mood is quite skeptical about OA, although the conclusions could maybe have been drawn also for non-OA low-level journals (but the author didn't test them).