For me, Zombie City. It's a terrible game and the developer seems to be doing 'retarded acts' to attempt to gain popularity but ultimately failing. And the use of quotations that are implied negatively or neutrally as positive is wrong in my book.
I searched far and wide for the LOWEST ranking Adventure Game. I then played the game for 5 minutes and wrote a review here: 5 minutes with the WORST adventure If you actually read the review- you might be surprised.
As long as nobody says it is my game, I feel OK. Call it the 2nd worst if you'd like, as long as there is somebody I can push in front of the Criticism Train™.
Law and Order SVU. love it. (i wonder how many people will freak out) however, staying on topic. Worst game was Rolando for me, hated the whole idea.