I have been a Toyota owner for years and a Toyota mechanic but when I needed a new car I thought I would try my first Nissan. It was a mistake. To compare the design quality of a similar Toyota such as a Corolla to a Sentra is like comparing night and day. Here are some examples. The trunk on a Sentra is much smaller than a Corolla. Additional Sentra problems that Corolla does not have: engine performance-poor. Cruise control is too fast and the trans immediately kicks down. Fuel economy is no where near the 40 MPG other reviews have stated. I get about 28 MPG. Radio sounds bad. CD player is a joke. Who ever designed the cup holder should be bared from auto design for life. I could go on.
Cannot think of a single thing. This car an embarrassment to the Japanese car industry.
Complete redesign from the ground up. Start with a variable advance cam like Toyotas have. Improve the fuel economy. Make the cruise control a slow design. Move the cup holder from in front of the CD.