I drive an 08, and I have an HTC evo.

I never receive any complaints about the mic.

 

I have a 07 G35x, and a 08 G37s coupe
Im using a Htc Thunderbolt with Verizon wireless and haven't had and issues

 

This is my first post on this forum I think...but I gotta add to OP's complaint.
I had 08 BMW 5, and most people didn't realize I'm driving on freeway doing 70~80 mph.
No road noise or what so ever...
But this 13 G37s Coupe....
People don't want to talk to me anymore and they immediately notice I'm driving.
I'm getting a lot more of "hey you are driving.. should I call back later?"..

I'm using iphone 5 with Verizon btw.

I think Infiniti went so cheap with the microphone hardware on this car.
So whenever I have important calls to make, I use the earphone that came with iphone and people say it's much better compare to Infiniti crap..

just had to vent out...I guess.