Well, at least notification screen is usable in 2.0. Currently it's more or less useless. Having navigation between app-screen and notifications sideways is definitely an improvement.

Another thing people overlook is that new way of accessing grid (bottom swipe) allows having more than 9 open apps at the same time because scrolling app-screen can be done (at least in principle) without hindering grid access.

Bad thing is that lock screen doesn't seem to allow quick menus. Shouldn't be an impossible thing to implement, but maybe they want to stick with cleaner looking lock screen.