Now that I really think about it, most Nintendo consoles/handhelds at launch. Got a DS Phat around when it first came out and it sat on a shelf for a least a year and a half until I got more games for it. Got a Nintendo Wii for the family, we played it a bit together but then it gathered dust for a year. Finally hacked it after that, and played a few games I couldn't get a hold of but other than that no one ever used it. My older bro recently took it off my hands. And of course the 3DS, I traded my DSi in for it so got an $80 price drop which was cool, but instantly regretted it. It sat for months until I finally sold it off.
Also the PS Vita at launch as well. At the time no stores had any Memory Cards larger than 4GB so I decided to wait until an 8GB came available, so I couldn't even do anything for a bit. Once I got one, I played a few PSP titles on it and hardly touched Uncharted. Once I got that PSP exploit via some bubble game (which I played a shit ton lol) I used it for GBA/SNES games which was nice. Eventually I sold it to pay for my 12" Subwoofers which I have used infinitely more than the PS Vita
I suppose this isn't necessarily gaming related, but I also got some crap chinese Android tablet for Christmas a few years ago. It wasn't too bad specs wise, had a 1GHZ processor and 1GB of RAM but the touchscreen was absolute shit and didn't work. Luckily I found a nice USB cable so I could use a keyboard to get around and everything and used it as an emulation device but eventually the CPU overheated.
My dad has bought maybe 6 or 7 different off brand Wiimotes, all of which never worked for more than a week.
I'm almost positive I have more, my dad buys a shit ton of stupid stuff whenever he sees a good deal.