Agreed. The portal view is the only one that makes sense to me, but it is too limiting in that it is only those X recent posts.
There was something weird about the 'new posts' page - I forget, but maybe it doesn't display the recent thread if you visited it? But that makes it hard to go back to one that you wanted to review.
Here's the link that explains why I don't care for the 'new posts' page.
PORTAL VIEW and NEW POSTS VIEW not in sync?