How reliable is Chevrolet Malibu compared to Honda, Toyota and MAzda?

My mother is looking to buy a new car and it seems 2015 Chevy Malibu is the cheapest mid-size sedan available. The price at the local dealer is $17,500 compared to $23,000 Mazda 6. My Mazda protege has almost 200k miles and has never ever given me any trouble. However my 2009 Subaru Outback with 60k has been nothing trouble. So I was wondering how reliable are those Malibus? Do they need expensive repairs done often?

Thanks for looking! :D

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