My first impression, purely from a visual standpoint, was that the site has a very clean, uncluttered design.
This forum has many of those little features I'd always wished were a part of the other communities (the ones staff will always say are too much work to implement, etc. etc.). I love being able to "like" a status finally, heck, I enjoy having to option to do more than just "like" something. Both of the themes are pleasant, my preference being the Dark theme, and everything about the graphics appears clean.