is that they're displayed out of context. You don't know the previous posts that led to them, or what comments elicited those responses.
Most of y'all know I couldn't care less about 'social networking', especially 'Top Rated', 'Most Popular', etc. I might find some value in 'Just In' if it were treated like the old *NEW* flags, in a different color that makes them easy to pick out of the older content, but still in place within the conversation.
This isn't going to run me off, but I think these two features unnecessarily clutter a discussion. Combine this with the sort sequence in the Discussions lists ('Started On' vs. 'Last Modified') and I find the navigation to be more cumbersome that before. I also seem to be coming here less often.