Absolute best rental I ever had: 2010 Ford Fusion SEL, 2.5L I4, 6-speed auto, leather interior, new & clean! Rented this from Avis in Ottawa for a business/pleasure combo trip in May 2009. When I saw this car on the lot, I asked for it and to my delight it was available! I loved it and I can say that if Ford offered a 6-speed manual transmission in this trim level I would have been seriously tempted to ditch the (crashed & squeaky) Mazda 6 to buy one of these.
Second best: 2009 Hyundai Sonata GL, 2.5L I4, 5-speed auto, not new but clean! Rented this from Budget at San Francisco airport in July 2009 while on a business trip. This was another one of those where I had choice, this time I didn't check my luggage and I was though the gates and first inline at the rental counter... Among the PT cruisers, Calibers and Malibus, way at the end a lonely Sonata had my name all over it... Did not regret that choice one bit while I cruised the Bay Area freeways with ease and comfort.
Worst ever: 2009 Chrysler Seabring, V6, 4-speed auto, new and clean. Had this inflicted upon me by Di$count as an "equivalent" replacement vehicle when my Mazda was in the shop for the rear end collision back in September 2008.
handling, rough ride, rock hard seats,
poor gas mileage, headache inducing VOC's, in summary "craptastic". After a week, I could no longer stand it and turned it in for the second worst rental I ever had the misfortune of driving.
Second worst: 2008 Mazda 6, I4, auto, not new and
not clean! The most disgusting smell I've ever sniffed in a car... Someone spilled something with milk or cream which soaked into the back seat and carpet and spoiled. The Di$count boys attempted to mask the odor by stuffing several sheets of bounce under the seats, but that only masked it temporarily while I inspected and OK'd the swap. Once I started driving, I had several near vomit inducing whiffs of the foulness... I had to continue driving (with the windows down) to make my appointment 2 hours away. I ended up taking my Hoover steam vac and washing the seats and carpets in that car. The smell was gone - I figured we had to live with it for about 3 weeks so what the heck... 2 days later, some yahoo missed a stop sign and crashed into it. After that we got a V6 Impala and that was so-so for a rental... had better, had worse...