The Datsun GO is indeed a very nice car. Your apprehensions about it are also justified. But, if you are looking to own this car for a longer period i.e 4-5 years, these problems would not be as pertaining as you think. The build quality of Datsun GO is very sturdy and reliable. The company is also planning to expand it's operation in India. But yes the resale value of Datsun GO is not at par with it's rivals. But if you want a car that would last it's course, Datsun GO is pretty good.
Datsun Go comes with a mobile docking device with front speakers, so you can play music saved in your mobile through this system. There is a USB port, but it is to charge electronic devices and doesn't support USB devices.