I have a 2006 Prius and just recently we got a 2014 Prius V... And the '06 has a vastly superior navigation system. The '14 comes with crapware-loaded Entune and some of the worst user-interface decisions I've ever seen in a product.
I like that it shows me the traffic, but it'd be nice if they licensed Google Maps for the information so it'd be closer to accurate. And it'd also be nice if roads in cities weren't grey-on-grey with grey text. (Why are you showing me that I'm in a city by changing the background to grey anyway? Is the population of the current governmental entity really critical information when driving?)
It's also somewhat amusing - but also irritating - to see garbage like Bing or MovieTickets.com in the car screen, which work if you connect them to the internet on your smartphone... But if I have my smartphone in the car, wouldn't I check movie times on that, instead of a never-updated slow app whose interface was designed by someone that wears their pants on their head?