Basically all fake RPGs, that are actually action games with some shallow RPG mechanics painted over.
Worst of all though?
That would be a hard choice since there are several contestants there...
Ass defect 2 and especially 3, although ive only played a demo of the second game and then lol quit after half an hour. The third was sufficiently processed around the internet to not even require playing. Which would have cause internal hemorrhage and probably permanent brain lesions.
I would still go for Facepalm3 by bethesda.
Although wasteland 2 is getting really close to topple that. Looks like it was written by the same team of writers that seemingly work for bethesda and bioware. Or well, actually EA. But atleast the mechanics are bit better.