It is tailored towards Kinect, which shouldn't be denied. And yes, it's much slower in comparison to other OSs, because of the obvious omission of the non-Kinect layout. The weird thing is, you only complain about the PSN store, which is slow, I admit. But other than that, the OS on PS3 itself is MUCH better, again, what my original rant was about. I like how I can be doing something on PS3, decide to switch, hit the home key, and it'll cancel it out and go to it automatically. With the 360, you have to go to the home screen, wait for it to load, go to what you want(which is a chore), wait for it to load, then final be able to play it. You save about a good 1:30-1:45 per overall change on PS3.
As far as what I originally said about controller users vs Kinect user. Yes, it is MUCH slower for controller user for many different reasons. Saying things on demand, or just pointing to them, as apposed to going throw about 2-3 menus is longer. It just sounds like you have Kinect and like it. I've used it, and liked it, but it only works for its menus. Other than that, Kinect is horrible.