i think the answer is “it depends”
do you have something to say about it? comments? suggestions?
do you think writing about it will help you understand it better? help someone else understand it better?
think you format is better? or a different point of view needs to be added on your blog?
lots of reasons to say it has already been written, and if you are just going to copy what has been done then no…
but take what you have read put your own twist to it and add what you think is missing and POST IT!