Same here. Not only MII was quite slow but it died for no reason - adequate cooling and PSU was 3 times more expensive than rest of that PC (4 SCSI HDDs and 2xVoodoo 2 included) - separate regulation for each line, overvoltage/overload protection etc.
Probably a Nintendo 64. It wasn't so much what I bought as it was WHEN I bought it. I got one in late 1998, and I really couldn't spare the time or the money. I already had a PlayStation and Saturn, and I didn't play the Nintendo 64 nearly as much. I didn't even finish Zelda! And half the people I knew had Nintendo 64s anyway, so buying one of my own didn't make sense. It's not a terrible system or anything. I just didn't need it, and there were a dozen better ways I could've used the money. I sold it after less than a year and bought a used one for forty bucks in 2001.
My PS3 - had it, modded it, never used it - sold it a couple of years later - never had so much a blemish on it - you would think it was brand new
Tony Hawks Shred on the 360. I knew it wasn't rated that well, but I thought I would get at least some fun from it enough to justify a purchase. How wrong I was. I mean sometimes I get enough enjoyment of a crap game to make it not a waste of money but not with this game. I do think it's a nice looking/feeling peripheral, but everything else about it is crap including the awful game.
Anything made by MadCatz. I could write a huge essay on how horrible their products are. One of their controllers fried my gamecube.
My retro gaming PC is built around a Cyrix MII 300, which hasn't caused me a single problem ever since I first got this back in late 1998 - I'd actually wanted an import Dreamcast for Christmas that year, but ironically my desktop has managed to outlive three of Sega's consoles (so far)!
The Commodore 128... All I ever typed in C128 mode was 'go 64', what a waste of money, should have kept the C64.
See, I knew that a ton of people would sell PSVRs within six months, so I'm just gonna get one off eBay sometime later this year.
I love mine to death but I definitely think it's aimed more at enthusiasts and people who love their tech. I expect a lot of the more casual gamers will either sell it or put it in the cupboard next to the Wii Balance Board and not touch it for a few years. Hopefully I'm wrong though, it's a great system and it'd be good to see bigger and better titles to come to it which will only happen if systems and games sell. The Dirt Rally VR DLC was released today and it's awesome, hopefully a sign of good things to come. Resident Evil 7 apparently did well in VR sales.
Shadowgate for the NES. It looked super cool, I was a kid, but spending $60 for it and beating it in three days was pretty lousy.
The Nintendo Wii, oh sure it had some cool games on it... but the fact that I ended up using it as a homebrew device after a year of owning it speaks volumes.