I rented a Malibu recently and it's overall a nice driving car, with a nice smooth engine and good looks as far as typical mid-size/full-size sedans go. My biggest complaint about the car, however, is the ridiculously small-sized opening for the trunk. According to Chevrolet, the trunk is 15.1 cubic feet, which is fairly normal for this size car. However, the "height" of the opening (i.e., from above the rear bumper to the bottom edge of the open trunk lid) is WAY too small, so that it's really difficult to make good use of the space and put in larger suitcases (or kids' bikes, as I was trying to do).
I've wanted to try out the Malibu but on a prior trip literally could not get all my luggage into the trunk because of the small nature of the opening and so switched to another sedan. Just a warning to those of you out there who try it out. It's a nice drive (certainly a nicer car than the Impala, which is often the other alternative available), but if you're looking to get a car to fit a larger amount of luggage, it comes short in that area.