It's decently legit, it's on PubMed and is run out of UCDavis. Submissions definitely are not guaranteed to be accepted and lots of "big name" dermatologists have had things published in DOJ. They end up publishing a lot of things that people either want to have published sooner (the turn around time from submission to acceptance/rejection decisions to publication is relatively quick compared to most journals) or that they don't think would make it into JAAD or Archives. They also end up publishing types or articles that JAAD or Archives tend to avoid (e.g. medical economics studies). It certainly has a different goal as a journal just given that page limitations aren't in play. That being said, the chair at my med school called all derm journals aside from JAAD, JID, and Archives "throw away journals" so I think the jumpoff for pretty much any derm journal is pretty large when compared to those three.
