The DS lite, and DSi are vastly more elegant machines than the 3DS in both ergonomics and function. The circle pad sucks, putting the focus on 3D for the top-screen hamstrung countless games performance-wise and the asymmetry between the two screens ruined the harmony that the DS had established. It's like the Game Gear version of a DS. The original model's build quality (membrane buttons) and ergonomics are absolute trash, and the screen quality was worse than the DSi. The 3D trick only worked especially well once you got to the New 3DS's which could use the camera to orient the 3D to your relative perspective, and even then most people don't even like or care about the 3D screen (that again, caused a lot of problems for games from a fidelity of what's possible angle to other more esoteric issues.) There are even ways that the 3DS was less capable of 2D graphics because of the difference in hardware, which was insane given that its backwards compatible. Also it launched at a dogshit price they immediately had to walk back. Also the circle pad sucks and there wasn't even a right analog input.

In conclusion, fuck the 3DS. DS(i) for life.