Even though there are a few bbPress features I wish for, I know that not everyone needs all possible features. So I'm happy with many things being relegated to plugins.

I actually see the slim feature set as a plus. A lot of forum software is bloated and hard to use for both users and administrators. I appreciate the light footprint that can be added to as needed.

Plus, the tight WordPress integration is a killer feature that outweighs a few gaps in other areas.