Love my Vita but yeah Sony failed the Vita. Booed on stage with AT&T. Memory cards. Too expensive in 2012. (3DS was $50 and was struggling until 3DS price was lowered) poor marketing. Sony barley supported it and after 2013 hardly mentioned it at press conferences. Maybe Sony wanted Vita to be the Bro handheld with FPS and maddens but turned into the SEGA Saturn/Dreamcast of handhelds with a lot of smaller great niche games. Indie and Japan. Vita is just flat out an amazing system. I also love the Vita TV tho it was a rushed product. Vita TV should have come out in 2014 and shipped with a DS4 so all games could work on it.

Vita stumbled so Switch could run full sprint.

It didn't exactly failed... but we lost it anyway: Dual screen gaming. The NDS, 3DS and Wii U offered some very neat features thanks to their dual (touch) screens. Sadly, with the launch and the tremendous success of the Switch, it's safe to say we won't be seeing nothing like it ever again.

Coming from someone who loved playing PSP it was a damn shame. I didn't get one as it just didn't have a game or system seller for me to consider. The hardware was top notch though and was in a lot of ways ahead of its time for a portable - OLED screen, full miniature analogue sticks capacitive touchscreens etc.

Dreamcast was my favourite of failed consoles I owned. From launch it had a brilliant library of games. Sadly it was short lived between SEGA practically running out of money at the time, rampant piracy and PS2 finally laying it to rest. Had a lot of fun with it though. And I even bought the light gun for it and everything!

Sega Saturn.
It had obvious problems, but it also had some really excellent games like the Panzer Dragoon series, Nights into Dreams, Burning Rangers, Radiant Silvergun and Powerslave/Exhumed.
I even liked it from a hardware point of view; it may have been hard to develop for but it was internally fascinating and externally attractive.

This, along with the (likely) N64 Final Fantasy.  It was never officially confirmed that the below demo was intended for release on the N64 but the graphics are clearly a lot closer to N64 than PS1 and this was also before the Nintendo/Square breakup:

https://www.youtube.com/watch?v=TPO7c_XmesU

Heh I was just playing the English translated version of Bulk Slash on my Saturn yesterday. yeah one of my fave consoles with a massive Japanese library of insanely great RPGs,Fighting Games,Shoot Em Ups and all kinds of arcade games and such. It's my fave system to import for. It's why I pin the N64 as the worst console of the 3 main ones. Not calling N64 bad at all, just was in last place in terms of total library.

Don't get me wrong I love my PS systems but I still wish Saturn won that generation.

Yeah, I remember that trailer..

I read in Nintendo Power that Namco was supposed to release a sequel or prequel to Tales of Phantasia on N64. Nothing ever came of it. I think that might have ended up turning into Tales of Symphonia on Gamecube.  The lack of RPGs is what killed the N64 for me. Now I have a Switch with a butt ton of RPGs in my library.

I thought it was interesting, but I'm honestly kind of glad Nintendo moved on from that (for now.) A lot of games I got for DS and 3DS basically used the second screen for maps or inventory. The Zelda DS games are my least favorite in the series because they require the touch screen for everything. I did think being able to draw a trajectory for the boomerang was a neat idea, though.

I'd like to say the Gamecube. I'm not sure that I would call it a failure since it sold as well as the Xbox did, but I wish it had gotten more respect. It's one of my three favorite Nintendo systems, along with the SNES and the Switch. I found the N64 to be a disappointment, but the GameCube did a lot to win me back to Nintendo. Two of my favorite Zelda games, Metroid Prime, a small selection of excellent RPGs, and my first wireless controller. Some years I bought more Gamecube games than PS2 games. I wish Nintendo would start bringing more Gamecube games to Switch.

Being able to access the map and do inventory management on the fly was incredibly useful to me in many games. Also, the dual screen concept made possible some incredibly unique experiences that ended up as some of my favourite games ever like The World Ends With You, Hotel Dusk, Rhythm Heaven or both NDS Zeldas. Yes, I love those and I think they are better for using the touchscreen.

But to each their own I guess...