To those decrying the dashboard because it was changed "just to work better with Kinect", that isn't true. It was changed largely due to the addition of the new apps system, and all of those wonderful things that came with it. The previous dashboard could have been updated to function with Kinect quite easily, and if that was their only goal, that's all they would have done. No, this update was to facilitate the new apps/channels/services that are now available - the 360's first real step towards becoming a truly unified home media entertainment system, and it was a good first step at that. The Kinect functionality was just added at the same time.
Basically, if you don't like it, hate on it for the right reasons. If you don't like the way it looks or can't adapt to how it browses, that's fine, but don't take it as another opportunity to rag on Kinect, it just makes you look uninformed.
As for my opinion, the update added a lot of fantastic things, and I'm already a subscriber to many of the services it added, so I'm getting a lot of use out of it. It's aesthetically appealing, works wonderfully and smoothly with Kinect, and the ads don't bother me, though getting to XBLA and browsing the titles is a process that's a little longer than I'd like.