Whats wrong with the Nexus 7 v2 ? (I havent used it myself).
It was a significant improvement. Hardware was much better all around. The biggest thing for me was that even as a recent device I still see a noticeable screen lag as I scroll on it.
Of course the rest of the problems are OS-related (even vanilla).
EDIT: I was referring to the Nexus tablet that came out not long ago (though we do have a Nexus 7 at the company also)