I very much like my Kindle Fire HD. Even though it is one of the main competitors to Apple's iPad, it does not get much attention on Android sites. The Nexus 7 seems to the be champion of Android at the moment.
THIS REVIEW does a good job describing what the Fire HD is, and what it is not. It describes the "Amazon Experience", the Fire's capabilities when it comes to books, video, music, apps and shopping. The article compares and contrasts the Fire HD to the Google Nexus.
It is a good review, and if you want a tablet computer and are debating between a Nexus and a Fire HD, this is a good article to check out.