It sucks. It just makes everything more difficult and memory consuming than it has to be.
I remember the first month I had it I kept opening random apps because I was lightly dragging my finger across the mousepad.
Anyone tried using the built-in Skype app? It's laggy to the point of being unusable, not to mention obtrusive as hell.
Another thing that annoys me is when you go the app screen, it shows all these randomly selected pictures from your folders and Skype contacts. I'm doing something on my computer with a chick in the room and BAM -- there's all those naked girl pics I hid in some obscure folder where I thought no one would ever see them. Oh, and there's a massive picture of one of my female Skype contacts, too. Great.
There are a few features that might be handy if I cared to learn the OS, but that's the whole point -- you shouldn't have to LEARN your OS. It should just work.