Well, here's my .02:
Voice response - forget it
Bluetooth phonebook - random selection of one phone number per person, one at a time? What were they thinking.
GPS - I find it to be very good in general. Here's how to bypass the "safety" feature (at least in my '06): Menu/Audio. Touch upper left, lower left, upper left, lower left. On the screen that appears, hold "Bypass" until it turns black. Hit Back. Unfortunately, you have to do this every time you turn the car on. However, you can do it while the car is moving!
Mileage: Local roads I get 30 to 32 in warm weather. Highway I can get over 30 as well setting the speed control to 55 - 60. Having the bar graph on will teach you how to do this.
Annoyances: that "surge" you occasionally get as you roll to a stop! Rear wiper (but my dealer has replaced this free a couple of times). Front floor mat wearing a hole at 20K (once again - a whole free set from my dealer!)