The only gripe I have so far navigating the site is that when I press the back button after reading a thread, it sends me back to the top of the forum. So to read older threads I have to scroll to the bottom and click "Load More" to view older threads. I can read those threads, then if I hit my browser's back button, I'm back to the top and have to repeat the "Load More" process as many multiple times as is necessary to get to where I was.
A workaround is to just open threads in new tabs; this way your original tab hasn't lost its place in the forum thread list.
I much prefer the way your average forum works which is to just have pages of threads as opposed to a huge expanding list with a "Load More" button at the bottom.