I have owned two mustangs. I stil own my current Mustang. There is some road noise but you can fix that. windows don't rattle, there is no shake. There are so much after market stuff to improve the car. Check out the different mustang club for more info.
They are very, very good. Take a look at consumer reports, they do a great job of providing this kind of information. To go on there site online you have to pay a small monthly fee but you can buy their magazine at the grociery or book store. There overall reliability is much better then average and they have an excellent repair history and re-sale.