This mean when it comes to the pure quality of the series, so a 5 star clearly deserves to take the time in advance.
The point on which you want to get upset, is the absence of options to disable the subtitle. Although (original with subtitles clearly marked) is included in selling title "subtitles", but also no OV without subtitles is available on Amazon.com. It would only be half as bad if you could then refer the series on Amazon.co.uk or Amazon.com, but these are regional locked and German customers can only accept the poor service from Amazon.com to complete.
I advise friends of original versions that bothered by forced subtitles, therefore the purchase of digital products now and suggest to switch to other sources of supply.