original XBOX. nothing could be worse than that. the N64 has bad graphics and all, but it was the foundation for much better preforming systems and it started the mario franchise
PS2 It took everything that sucked about the PS1 and amplified it. The system only sold so well because of marketing. The games blew, there were just like 2000 of them, I would rather have 10 games and 8 of them be good(Xbox) Or have 20 games 15 of which are targeted at babies, but the last 5 are amazing(Gamecube) than have 100 games and only 7 of them are good...
I forgot about Virtual Boy.. Yeah, probably the worst thing.. It died in less than a year, only had like 8 games (whoa! bowling? I haven't seen that on virtual boy) and I dont think it had a head strap or anything.