It's actually a rare occasion when I call upon the horrendous memories of bad games long past. I find it a little difficult to separate the subjectively bad with the technically bad.
Although I've never played it, I've heard nothing but horrible stories about E.T. for Atari, stories such as that of landfills littered with the remains of copies from disappointed patrons.
...
From that information alone, I think I'll go with E.T.