Thank you for your opinions.
I agree that the music app could be a lot better with a visualizer. I've been wanting one of those too.
I don't think that the interface is slow, because it needs to contact the internet for most everything it does. It's not abnormally slow for me. I click something like 'Movies' and it takes like 5 seconds to come up with the screen filled with pictures. It's not any slower than surfing the internet to me. The only thing that slows occasionally is Netflix during peak 8pm to 10pm hours. The menus might take up to 10 seconds to come up, but I understand it's the internet, and it takes a little bit of time.
And yes, I think Apple TV should be opened to developers as well. But this will happen sometime.
Right now, it's still a great device for me, because there aren't any better options for ME.