O'Reilly Media's Joe Wikert, who has been blogging about Kindle-related stuff for about as long as I have, makes an excellent point about the importance of software updates for the new Kindle Fire tablet. Amazon was lackadaisical at best in updating the software on the old Kindle ereaders.
My point is that it doesn't appear that Amazon dedicates enough developer resources to their Kindle platform. That may have been acceptable in the eInk, dedicated reader days. After all, most customers only expected their eInk Kindle to do one thing and do it well. With the Fire though, Amazon has now entered the tablet arena and the expectations are different, particularly since they're pushing so many cloud-based content consumption options (e.g., music, video, etc.)
-Kindleville Blog, November 16, 2011