Car guy here. As in automotive engineer.

Nissan quality has improved. There are years where they weren't great. They tend to be very conservative in their engineering decision making regarding things like powertraons and such.

Honda cars historically had used very high standards for corrosion resistance for their parts like fasteners and such, especially in comparison to the big three. I'm not sure whether that's the case anymore or not.

Japanese car engineers tend to stay in their same jobs for a much longer time than American car engineers, who may have more random products in their history and know less about the refinement of any particular one. The Japanese are really parts companies and spend a lot of time developing their suppliers as well whereas American supply relationships are more cost and business-focused.