They are legit. Maybe now Waypoint edges them out as they seem really dedicated to doing good investigative stuff (Klepek and others), I dunno, but it's pretty much those two and Eurogamer doing the heavy lifting in the "widely read" spaces.
(Also, since this obviously pissed off people on the feminist side of things too, something really weird happened: people started arguing that obviously the gamer complaints about Kotaku not being about gaming anymore were really just misogynists trying to undermine feminism, because if they really cared about it being gaming-focused there was far more unrelated cheesecake than feminism and social justice posts. Except the unrelated cheesecake posts were a huge part of what created that idea about Kotaku in the first place; they'd been had!)