Well the nav is far from useless, but the Wi-Fi is a faff.
In fact you can't buy a CX-5 now in the UK with out Nav, a few makes have also gone that route, the new X1 for one.
I use a App that sets up a Wi-Fi hotspot at the press of a button, I've called it cx5 and given it a simple password that's remembered by the app.
So all I do is select the app and press start, job done.
The faff is having to remember to start it up which involves removing the phone from my pocket to unlock it and start the app.
When it works the live traffic is well worth having, the weather and fuel less so.
Problem is because the street name obscures the data signal and phone data its a real pain to actually see if everything connected, I use favourites to establish phone is connected, and traffic information on the nav screen for live traffic.