2DS. because I thought I didn't need 3D. Well, I didn't, but the form factor is just terrible, went back to 3DS and later New 3DS XL.
Wii was also terrible, granted I bought it super late. Wii U > Wii.
PS Vita, great hardware, played through P4 Golden, and that's it? I was kinda done with portable at that point.
OG Xbox One. Forza Horizon 2 was cool,
Edit: Vita should be off the list. Persona 4 Golden was amazing and worth the price of admission.