I'm simply asking you why you don't like it. Nobody can seem to give an appropriate answer other than, "I hate it. It sucks. DIE IN A FIRE!" It's a library for music, much like Windows Media or WinAmp with many of the same features. Each is unique in it's own tiny ways. None of them suck (unless they just don't work).
On Windows it's bloated and slow. Frequently had installation issues with it in the past when I had to install (or re-install) it on clients' machines, as well as the notorious CD/DVD filter registry entry that basically killed off the optical drive entry on the system unless you removed the registry key that iTunes put on there - even that that didn't always solve it and would end up requiring a reinstall.
Overall it's been very buggy and not performing very well. As well as installing tons of extra services and such that all want to run on startup. It may run fine on a Mac, but Apple didn't optimize or create it well at all for Windows systems.
All of that being said, I rarely use iTunes. I have music, but I usually listen to music on either Pandora or YouTube. I personally refuse to pay for music services, so it limits me a bit these days. I'll listen to the good ole FM first.
Just get your own music and put it up on a Plex server - then you can use the mobile app or the web player.