But it can be fixed so easily. Have you never installed a 3rd party application because the Windows offering was too basic and didn't do the job that you wanted it to do?
The PDF issue can be rectified with Foxit Reader which is a much better choice than either the Windows 8 app or Adobe Reader.
What email client do you use? Windows Live Mail or Outlook? Or maybe one of the 3rd party clients like Thunderbird?
How about media players? Do you like WMP or would you rather use VLC which will play anything without having to add 3rd party codecs from uncertain sources?
Which anti-virus solution do you use? MSE or one of the other freebies, Avast, Avira , AVG etc..?
The Windows 'winner' has always been the huge amount of software available, much of it free or priced for pockets of all depths..