If you are using Windows 8.1, I would strongly recommend updating to Windows 10. It is a considerable improvement and you can hide away the mobile features semi permanently if you want.
Windows 7 users have a much trickier decision to make. Unless you need Windows 10 for compatibility with other devices, most home users will be happier sticking with the older version with its media player and other handy applications.
Windows 10 isn't that bad, but it is different and takes some getting used to. The absence of a built in media player is the biggest shortcoming for most users.