I've used very few trackers. I think I was turned off that the default is for all notes to be the same length, and that changing the number of beats in any measure seemed kind of involved. If you've never written music, and you don't own any instruments, and you open a program for the first time that shows you 8 divisions per measure with a steady beat, you'll probably make a lot of music before you discover what other options are available. Multiply this by a million users, and you've got the makings of a long-term association with RDM (retarded dance music). Try entering Debussy into a tracker and see how intuitive it is; and yet the music itself is very easy to listen to.