I'm not sure I agree with that, except the notifications part. Before the Droid I was a BB user for 10 years and Facebook for BB, IMHO, had a horible interface. You could NEVER see the same friends in FB for BB as you did in web-based FB.
One of the biggest problems it still has is say you have 500 friends but only want to really follow 20 of them. In FB (web) those 20 are all you see. In FB for BB you still get all 500, and you have to load about 30 pages successively to see all of them. Totally awful and RIM knows about this.
At least with FB for Android 2.0 I see EXACTLY what I see on web-based FB...which to me anyway, is important. I can check it a few times a day and not miss a thing.