Least favourite/most disliked Nintendo console?

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Gamecube by far.

The hardware itself was superb; small, quiet, powerful, affordable, and reliable.

Unfortunately, it's first party software, which is the main draw of any Nintendo console, fell short of the mark. Franchises like 3D Mario, Zelda, and Starfox that were epic and amazing on N64 were neutered and lame on GCN.

Overall, I rank them SNES > Wii > N64 > Wii U > NES > GCN