Well, I could easily make a case for the Monster Hunter series, and Steambot Chronicles, but those games had a few good redeeming values.
So I'll say Earth Defense Force 2017. It has bad camera horrible vehicles, terrible graphics, clipping, glitches, un fair odds, grinding, grading voice acting, and it just feels cheap. Like buying a knock off transformer, sure there's the obvious faults, but overall you can feel the cheapness. And that's not all, theres a complete crap vs mode just tacked on, but I could do this forever.
But, it's still a great pick up game, like something you'd find in a dying arcade and would play over and over. And at twenty bucks when I got it, probably less now, it's worth it. And it is just overall a fun game, while not being good.