Is it really as bad as many people claim? No, it was actually for the time period a console which made impressive quality games for some of them it did had bad games as well but decent ones as well it was impressive seeing games like Road Rash on 32 bit console since before that it was only on 12 bit things like the megadrive so you could argue it was to good for the time period.
It was also one of the first game consoles which had a CD drive which at the time all games were either on floppy drives or cartridges like the Snes or master system had before so you could argue they were one of the first companies to introduce a new type of technology into the gaming industry .
IT was black coloured why exactly did it fail compared to Sega or Nintendo put simply it was not marketed well and was also more expensive than the other mainstream things it was selling for around $350 compared to the others for around $120 at the time so big difference of prices compared to both and you have to include at this time spending $350 would be allowed you buy a good enough car or go on pretty decent holiday so expecting people to pay $350 was not a good idea by 3DO at the time .
Finding companies who were willing to design games for this company proved hard over the big problem with Nintendo forcing many businesses or people to agree to only make games this company meaning if you went to say 3DO or someone else you risk losing a lot of money part of why getting games made by people or groups were done thing to get overall. https://www.cardealerreviews.org/
The console was released in a time period of if you like too much competition so because of that you had so many businesses trying to compete for the same money part of why Sega or Nintendo took so much of it since they had at the time the most money but in the United Kingdom during this time period, Atari was if you like there most popular games system overall so that alone made it hard for 3DO to compete against them.