I finally gave it a reach a round last night (Some kids told me using the phrase "reach around" would make me cool.). It was pretty sweet. I haven't downloaded all of the apps yet but it was quite well organized and exciting to look at. I'm the kind of guy that buys A LOT of content. I can't wait for my weekly Marketplace update. It's cool to see content that I'm interested in being shown on the pages.
I don't see a problem with ads like many here. I own a PS3 and I don't complain when the "ticker" on the top of the screen shows me what's new on the PS3/PSN. I actually like it. I don't mind when I see an ad for the new Ford Fusion tucked away at the bottom of that spotlight (can't remember the name of it, really) tab. I don't get the hate for one ad in the bottom right corner of the XBL Dashboard. Everything else is just showing available content and things you can do with your 360.
Go to the music tab and it shows you available videos and artists. Go to movies and it shows youu the available movies. Go to games and it will show you new games you can try. I don't see the problem. I go to a site like Gametrilers or VGChartz to see what's new--but when it's right there on my Dash, it's a bad thing?
All in all, I give it a positive. Gotta give Netflix, Twitter, and some of the others a shot, soon. Also, I played on my game room 360 instead of my living room 360 w/Kinect so, aside from a few awesome minutes on Tuesday, I can't comment on how well Kinect works just yet (Though 1st impression is VERY positive).
That's all I got for now.
