Even if it's a nexus device it's pretty different from what we were used to with stock android : it's a blend of both the phone and tablet UI. Some apps are using the tablet UI, while others use the phone UI, and the launcher itself is based on the phone UI, rather than the tablet UI. What runs on the Nexus 7 is a form of Android that has never been seen before, and there isn't any other Android tablet that behaves in such a way, even those from Asus that are as close to stock android as an OEM can be.
Even with TouchWiz, the Tab 7.0 feels more like what we were used to than the N7.
I'm just stating facts though because I actually like the changes made for the N7 better, I think it fits a 7" screen more than the old tablet UI and I hope those changes will be copied by the others.
> You still get all the benefits of a full desktop OS
like hunt-and-pecking in the smallish menus on a 7" screen? this is just ridiculous, and (given their UI plans) way too early to be useful.