Aside from the in-forum notification system, people who like RSS feeds have another option. Discourse is built on Ruby on Rails and inherited its path magic. For example, here is the tag page for BITD posts:
But just appending .rss to the URL turns it into a feed:
Works with categories, tags, and more. Try it out and see what you think. For example, you might subscribe to all recap posts. Or integrate this with IFTTT or similar tools, e.g. to post game recaps automatically to Twitter.