I agree with the Mazda3 tyre noise criticism. I bought an SP25 GT hatch in 2014 and on any road surface that is less than pristine this car struggles to insulate. There are also vibrations inside the cabin from the front seat belt adjuster on the driver's side, the steering wheel and the centre console lid. There's a constant popping sound from the dashboard. There were several software glitches and the parking sensors needed replacing. This car has been a major disappointment. I can't understand why it's a motoring media favourite.
The CarsGuide crew, among others, have highlighted road noise as a rare negative on a classy car that's also been a long-term favourite with Australian buyers.