Guitarists prefer tubes because of their overdrive behavior. Tubes soft clip when overdriven, as opposed to SS which hard clips. The result is two very different, and very easy to hear, types of distortion. How a guitar distorts plays a big part of the sound the player is looking to achieve.
To an extent this is also true of audiophile tube gear. It isn't about what a tube amp does have but rather what it lacks: diode switching noise, odd order harmonics, feedback..... all of these things make music sound harsh and less realistic. A well designed tube amp doesn't sound "tubey" it just sounds neutral and correct only it has certain advantages over SS in terms of not creating noise that the human ear finds to be very unpleasant, noise that transistors all produce.
The very first tubes for audio use, DHTs or directly heated triodes, are the most linear and distortion free amplification devices ever invented. This can be proven through measurement as well as listening. The reason they aren't still used widely is because they make very little power, are very inefficient, and are made by hand via craftsmen instead of being mass produced. Convenience wins over performance, much like how the world is dominated by mp3s today.
Your comments sound like bashing based on things you've heard or read rather than actual experience with good examples of the products in question. I've had the pleasure of using both amplification types and find both to be excellent when well designed, but a properly implemented tube amp produces tone colors and harmonics in a way that is all but impossible to do with transistors.