However, the screen is "PenTile" (http://en.m.wikipedia.org/wiki/PenTile_matrix_family), which means that each pixel is only 2/3 of what we'd usually think of a pixel. And it really does look like crap, even at high densities (such as on the Galaxy Nexus).

If you calculate out the number of subpixels (what actually shows colors on the screen, the important number), the 2048x1536 display on the iPad is still significantly ahead: https://www.google.com/search?q=2560*1600*2/3+-+2048*1536