Kindle has been designed for book readers with average features and specifications. Having said that, there are many issues that Kindle must improve.
Firstly, the silk browser is slow and sometimes non-responsive. It is difficult to function on this browser. Secondly, if a video or music is played the sound is not sharp and clear. The sound reception is of low standard.
Another problem that Kindle has is low internal memory. There is only 8GB internal memory which doesn't suffice. The default background is static and can't be changed which is another issue.
Basically, in order to cut cost Kindle has compromised on features. The specifications are below average and needs to be upgrades soon. Otherwise, it is not a value for money product.
