Really? The iPad is more expensive, heavier, has lower ppi, has an inferior camera, has less RAM, and it is slower (according to the geekbench scores I saw). As a piece of hardware, it is undeniably inferior on paper. Yes, I love the iPad's build quality, and yes the ecosystem is great, and yes the Apple service is unparalleled, but as a piece of hardware it is not the best Apple could do.
Eh, what?
I presume you mean the Nexus 10, which isn't into consumers hands yet so there is no real feedback on it. It's marginally lighter, while having a different form factor which accounts for the different dimensions. The screens are for all intents and purposes a wash, as are the cameras; you should know by now that the software behind the cameras has almost as much to do with the end result as the optics of two different but similar lenses. Apple excels at this and Android devices are all over the map. In any case 'adequate' is all that's necessary for tablet cameras.
I don't know what scores you are looking at, but Anandtech's preliminary review shows that other than one or two tests that are based strictly on CPU speed, the Nexus 10 is barely on par with the iPhone 4S, let alone the new generation of devices. Most of its graphics scores are approximately half of the iPhone 5's scores. I fail to see anything there that leads me to believe the ipad 4 is but the class leader by a wide margin.
This article's charts do not have the ipad 4 in them, but use the iPhone 5 as reference.
http://www.anandtech.com/show/6425/google-nexus-4-and-nexus-10-review
This is their early investigation of the new A6x graphics chip. Note that most scores are between 20 and 50% higher than even the iPhone 5!
http://www.anandtech.com/show/6426/ipad-4-gpu-performance-analyzed-powervr-sgx-554mp4-under-the-hood