I hate being forced to use iTunes at all. I have an iPod Touch (Only reason I got it is because a friend hated it and sold it to me half price), and once the music is on there it works ok, but being forced to use itunes sucks since I run linux primarily, so I have to boot into VM or other machine just to copy music.
That said, I really don't know why it won't let you do stuff like, edit ID3 info, edit/create playlists, basic stuff like that from the device. You HAVE to do it from iTunes, which is so so lame since the device itself is plenty capable of doing it on it's own.
My DROID lets me just drop files to /Music and it plays fine 