I was a bit skeptical about this site at first with its massive number of graphics, links, and buttons in threads and trying to navigate that with a screen reader. But everything is tagged nicely with regions which makes navigating very easy, at least for me, although a newer screen reader user would be utterly lost.
There are some buttons in the threads that are not labelled. At the bottom of each post my screen reader reads, "Button, button, button, button, button Reply." Aside from the last one, I have no idea what the other buttons do. Also, the buttons above the edit field when replying in a thread (and probably when posting a new topic) are simply read as "button, button, button, button, button," so, again, I have no idea what they actually do although I'm guessing it's related to formatting the post. Hopefully this is something the team is able to fix with proper labelling and/or alt tags.