My sister recently purchased the Ford Fusion with all that technology packed inside, and It's by far one of the nicer infotainment systems on the market (IMO) -- but posters in here are getting it right. Fingerprints all over the mainstay console display is just ugly as sin only days after a fresh bath, so she always resorts to using the capacitive/hardware buttons.
Then there's the voice command stuff everyone is talking about. Again, all great for the one or two uses I get out of it when I borrow her vehicle for a day, but she never uses it and again, returns to using hardware buttons. Bare in mind, she is very technical, so she's used to all sorts of different interfaces and operating systems.
The bottom line is that the screens get dirty while already clunky, and the voice command stuff is still too much like talking to a computer. Until you can have easy conversational interaction with your device (or vehicle), neither interface is adequate as a replacement for current in-vehicle systems.