AiBO was not a flop. It was a product sold to tech enthusiasts and those with more money than sense. It was never a mass market product and never would be at its price point. The "floppiest" part about it was that when all was said and done, you were paying something like $3000 for a robot dog that really didn't do much. i don't think it was until the later models that they would actually walk themselves to the charging station. Software upgrades were in the hundreds.
Regarding NetMD, another big difference between the older MDLP-only Minidisc recorder/players and the new NetMD models is that the later often lacked the optical line in for recording digitally from sources. Later the NetMD models would get rid of line in altogether.
As much as i hate proprietary formats, MD and ATRAC3 was better than the CDRs and limited storage of the MP3 players we had at the time. People forget or just don't know that the first MP3 players were typically 128MB or less, which made them novelty devices that could hold at most three CDs of "CD quality" music. It wasn't until you transcoded them that you could fit more.
i won't even go into the cool, "collectible" MDs which were durable as hell or the fact that players had awesome sound quality. They also got awesome battery life, particularly for a device with motor. ATRAC3 was a much better format than MP3, and was more comparable to MP4 in terms of compression ratios. Sony drug their feet releasing transfer software that didn't suck ass, and then with releasing software. They're far better in comparison now, but back then they were their own worst enemy. In the face of the oncoming flash media player onslaught, MD was a doomed format, sure, but it could've been relevant for longer in the US had Sony not been so inept. Hell, it lasted way into the iPod's life in the UK and of course Japan.
Xbox and Gamecube... failures? Xbox was Microsoft's foot in the door. A box that was friendly enough to hacking and piracy which helped establish the brand. It succeeded as part of Microsoft's "toss money into a market until we're relevant" strategy, and on the first try. And the Gamecube, was not popular, but profitable. The Dreamcast was the biggest failure of the decade (distant second to Nuon), and i say that was a big Dreamcast/Sega hardware fan.
Don't even get me started on Zip drives. The only flops in that line were the Zip 250 and 750 which didn't work in the Zip 100 drives and competed with CDR discs that were cheap enough to add more sessions to until it was full. Even for those of us who had a CDR drive (read: Not a CDRW drive), the Zip 100 was the easiest way to transport those "too big for a floppy" files.