How about
10. Their current Virtual Consoles
9. Not sealing a 25bn dollar deal with Microsoft in 1999
8. GameBoy Micro
7. Not investing enough in new IP's that are good (ex. losing a Skylanders opportunity)
6. N64 cusing cartridges
5. Wii U marketing
4. Having poor launches with a crappy 6 months + following
3. N64 DD
2. Virtual Boy
1. Creating PlayStation
I think the PlayStation is their ultimate failure. It's been their biggest competition ever for years
XBOX ONE/Wii U/3DS/PC
RIP Iwata 12/6/1959-7/11/2015
Thanks for all the great memories!