You won't notice the blandness of the menus in time, as you learn them you'll see how "bland" means "functional" which is all the menus are.
Where you spend almost all of your time, the While Playing Screen (or WPS), can be modified with themes, and some of them are quite pretty (though, the prettier they are, the less useful they are (in general) so you must find a balance).
I started using my iPod with Rockbox. Recently, I wanted to watch a video (I have a 5G) so I started fiddling with the iPod interface, and absolutely abhorred it. So, I think the things you don't like are likely just the differences from what you know. Give it time, you'll get used to the interface, and it's worth it!