It's not a retina screen! It's only 1024x768, so that the resolution is 163ppi. This has been a big complaint (or snark, in some cases) that I've heard from people who haven't laid eyes on this device. If all you read is specifications, then the iPad mini screen is far worse than the Kindle Fire's or Nexus 7's, right?
Well, put them beside each other, and the story changes. Web page rendering on the Kindle Fire is, frankly, awful. It's blocky, and there's a yellowish cast which personally I dislike. The iPad mini is bright, and white, and the text rendering is good – and there's no obvious pixellation. Kindle books look as good on the iPad mini as on the Kindle Fire. (The latter is optimised for reading those, but not for the web; Amazon would rather you bought books than surfed the web.) Icons on the iPad mini look sharp; on the Kindle Fire, not really.