Went today and looked at Malibu, Accord, Camry, Altima.
Malibu does rank near the top, at the top depending what strikes your fancy. Really the competitors are no further ahead, and it was a base model I tried... will be looking out for more loaded version. Seemed the rear leg room was best or near best of all I tried. Good interior design. Getting out, the side bolster seemed like it doesn't have firm enough foam in it.
Accord has by far the best instrumentation guages and buttons. Also good rear seat headroom. Front dash curve hit my knee when I got out of it. To me the styling is quite upscale, but depends on the model.
Camry (only tried the XLE, which may give it some advantage) had the most comfortable front seats. Felt very similar spacially to Malibu. Also, felt much more solid and higher quality than I remembered. Was impressed.
Altima had the worst graining on the dash, but the beige colour didn't help. I liked the front seating and I personally felt most comfortable. However, overall it felt a little older in design. Rear curved roof does hurt rear headroom.