Some time ago I have stumbled across SciRev, a very interesting idea of a website for sharing experiences with the journal review process (“reviewing the reviews”).
The idea is that researchers share their quantitative experiences for publications they had submitted to a journal (incl. rejected papers), e.g. duration of the review, number of reviewers, and decision time. The averaged values for a journal would help other researchers to assess its suitability for a publication, and to set expectations.
Its database seems to be mostly empty (Science has only 5 reviews, while Nature has 2). But it’s a fairly new service, and it takes only a minute to add your experience, so I hope that this valuable initiative will become popular. I have added my recent experiences with journals in the GIS field, and there is no reason that you don’t add yours now. 🙂