1. Atari Jaguar
2. Sega Saturn
3. Xbox 360 "Core"

From the consoles I have owned (SNES, N64, GC, Wii, WiiU, PSone, PS2, PS3, PS4, Xbox & Xbox 360) not including handhelds.

I would probably say that the Wii was the worst (Not that I think it's a bad console, It has some of my favourite games on it like Galaxy 1+2 and Skyward Sword) but it definitely was not up to par against it's competition.. It has some great exclusives but they are too few and far between especially in the later years of the console, Which is made all the more notice-able by the severe lack of third party support.

I'm not considering WiiU/PS4 because they are still new and I would only compare them against other consoles when they finish there life cycle for the generation.

Obviously if you are talking WORST console ever then none of the consoles I have owned even come close to that title, There are far worse consoles out there like Virtual Boy, Atari Jaguar and more.

Whaaaa? What did the Saturn do to you? It had great games.

Oh... i see that this thread got socially changed into: The worst consoles you have ever owned. xD

Atari Jaguar. Worst system I ever owned. I hated the controller.

I would say that lately I am more inclined to say that the worst console ever for me is the PS2. At least in my experience... had to repair that shit three times and even and even had to buy another one.

Of the popular ones i say 360 because of the way to high failure-rates

Where's CDi, Virtual Boy, Pippin and R-Zone? I will go with the R-Zone and here's why (refer to 15:20): 

You make a thread about the worst consoles ever but list the best consoles ever in your poll. Ummm, yeah, good thread. Answer: Intellivision.

For now Wii U because at the end of the gen, it will have the worst third parties lineup, even worse than gamecube.

Sega cd and Sega Saturn both bit the big one