I've been using linux mint for a year or two now maybe. It's fine, and actually there are several things I prefer compared to Windows.
One of the main issues with Linux as a PC OS is that you can't run as much different software as you can on Windows. This is largely due to the user base being smaller(IE, why develop an application for an OS when 99% of you userbase is not using that OS).
Creating a new OS to compete with Windows would have the same issue, and would also struggle to compete.
Also, there are so many different versions of Linux(distros), as in there are 600+ different distros so if you don't like one, there are many to choose from. Not liking Linux based on one distro is saying you don't like ice cream because you tried strawberry ice cream and didn't like the taste.