I'm not going to complain about the taking over the screen. Using my wheel on the mouse moves the page up or down in jerky movements. What would have moved the screen up a full page now moves it about 20% of a page in two or three jerks. Much the same way if you pushed the up or down arrows every second.
The ad bar at the bottom replaced the roll up window ads that were on the bottom of the home page. So it really isn't something additional, more something different.