Re. the audio info available when playing from an iPod or USB drive - I have found the file info available and navigation between files to be as good as any after market iPod player. Track info is displayed (artist, track name, podcast name etc) as I would expect for when it is included. Folder navigation is simple (up one level, up to top level etc).
My biggest complaint for the entire system is with the Nav. Entering a destination is quick and fairly simple (once you have practiced a few times) except for the final step. You enter the address, it shows on a map (with arrows to adjust the "crosshairs") and then you have to hit "destination" then "route" or something convoluted to do with the fact is offering up 3 route options. What about a shortcut, enter address, click start, boom.
As you say, the track info is displayed on the big screen, but it's lost amongst a clutter of other information.
There's lots of screen real estate, but the info is crammed up into a small space,
and is limited to only a few characters.
You have to touch the screen to see more.
That crosshair step on the nav is totally unnecessary!
No one is going to adjust their destination a few feet either way.
That should be an optional step for certain.
My biggest peeve with the nav is that I can't pick a destination while driving.
My Infiniti let me do a "Quick Stop". That is, while driving I could see the top
five POI categories (no scrolling) pick one and see the 5 nearest options.
I absolutely couldn't believe that while driving on the interstate, I couldn't
quickly route myself to the nearest gas station or fast food place!!