GameCube and Dreamcast definitely! Eternal Darkness, Smash Bros Melee, Metroid Prime, Pikmin, Tales of Symphonia, Grandia 2, Chu Chu Rocket, Crazy Taxi, Sonic Adventure 1 & 2, Phantasy Star Online 1 & 2.. Classic quasi-retro gaming!

Probably something Commodore. There are a lot of now-forgotten games and systems, though. Back in the day, you'd get a few free games with a magazine that some kid wrote in his bedroom. It's odd to remember a world without Internet...

"You'd get a few games" sounds so comfortable. The program code was printed in the magazine and you had to type these pages into the computer, save the file and run it... and hope that you didn't mystype any letter or number:

Here is the "listing" of the legendary Hypra-Load-System, which speeded up the loaading from the C64-floppy-disk-drive by a factor of 5:

Yeah Saturn for me as well.

Dreamcast gets a lot of (well deserved) love as Sega's console swan song, but the Saturn is often overlooked even today. It was a really interesting console with some real standout titles such as Panzer Dragoon 1/Zwei/Saga, Burning Rangers, Radiant Silvergun, Exhumed/Powerslave, and Nights into Dreams.

Bulk Slash is my fave Saturn game and I play Hyperdeul a lot. Best Shmup console of that generation. Maybe even the decade.

Don't know if underrated because it sold well

But PSP was amazing and I don't see much praise to it. Easily the best hardware of its generation for me, home console included

For me, it's a tie between the Dreamcast and Vita.

I can only imagine how different gaming would probably be if they were successful

Didn't the Wii won it's generation, though?

It did, yes.

I still feel it is underrated in terms of gaming discourse online though due to negative stereotypes. A system can sell well and still be underrated.

PSP