Seeing that this is an Aveo list, we are pretty positive about Aveos. I have a 2009 Aveo5. But mine has A/T and A/C and the fancy radio which added to the price of the car considerably.
As everyone said, it's a good little car for the price - as long as you don't expect it to be a Caddy or a Corvette. The newer ones seem to be more reliable than some of the older ones. Fit and finish are really excellent, surprising for such a cheap car.
Negatives? Gas mileage for city driving really sucks (22 MPG), (but it's great on the highway at 37 MPG) especially with the automatic. Very few storage compartments in the cockpit area. Mediocre acceleration. The suspension is unsophisticated and the ride is harsh when on bad pavement. The original tires are noisy and low grade, but you can replace them when they wear out.
They seem to be very reliable. Mine has 8000 miles on it and nothing has gone wrong with it, except for a minor problem with the accelerator pedal that did not affect driveablilty any. The dealer replaced it under warranty and gave us a loaner vehicle for a day.