Sure, I bet some of them are very pleasant to listen too.

Everyone has their own opinions. Some audiophiles will argue that multi-way systems will smear the sound, whilst others will say fullrange drivers sound like clock radio's. Then others may simply choose a fullrange driver for fear that the designer of a multi-way speaker doesn't know what his doing with the crossovers (which elektratig brought up). IMO, it's a waste of time to try and change people's opinions, so instead we can discuss what does differentiate the two systems.

What also came to my thoughts - perhaps it's psychological as well. I mean, I've got two different pair's of fullrange drivers here, whizzer cone type. Almost had convinced myself there was something "natural" or "coherant" to the way they sound as well, especially after a lot of listening - I kinda got attracted to them. But after that, I listened to a good multi-way speaker (not the ones I often listen too in my main setup, as I could easily bias in favour of them), and I concluded that the fullrange driver wasn't really that special after going back to listen to a multi-way speaker. But at the time, I had my mind convinced that the single driver sounded better, despite not putting my finger on it. That's the way I view these things anyway.

Adrian