I would say my favorite part about the forums is the community. I have rarely seen a forum this friendly and respectful. Most gaming forums are quite hostile, think the same way, throughout, or bring up subjects that upset people, daily. So, thus, I would never think I'd like any community this much to have the courtesy to be a part of its forum.
Another part of the forum that's my favorite is the media and discussion sections. I like browsing the art and stories of other people because it's inspiring. In discussion, I like to be a part or give my thoughts on the subjects other people bring up. Some give me a different thought about the areas they talk about or I post a topic to be read that could be a potential conversation starter.