I simply do not understand the iTunes thing. I have no idea why anyone would want to use a slow sync when it's easy to just copy files to the device and be done with it. RM policies convinced me to avoid iTunes at all cost, and I will continue to do so. YMMV.
Same here. I've got all my music on a 32GB SD-card in the phone. That's it, I'm done. No nonsense, no messing. I know what I want to listen to. I'm not really interested in fancy playlists, or favourites, or genres, or "*" ratings, or the fact I haven't played a certain song in a few weeks.
I found problems with iTunes when I tried it once, like it messed up the directory structure of my Music folder by doing it's own thing. e.g. storing all songs from one album in individual folders, one MP3 per folder. Well that's no good, fortunately I keep a backup. Also problems with some Chinese ID3 tags, by just showing gibberish. Samsung Galaxy S phone deals with these just fine, as does my crappy old Creative Labs thing.
iTunes for Windows runs a load of unnecessary services in the background, even when iTunes itself is not running, probably slowing the PC down, e.g. iPod Service, well I don't have an iPod, and what exactly does Bonjour do? iTunes on Mac OS X maybe much better behaved, because it's an integral component of that OS.