Has a game with an underdeveloped world and poor writing ever captured your imagination? What games come to mind that you would like to see fleshed out in a competent manner?

My pick is Mega Man X. The world just seems like it has so much potential, with the growing pains of humans and reploids as the two races awkwardly co-exist. Add the ever present Maverick attacks that are seemingly going on and I think it would be a very interesting place.
Unfortunately Capcom has shown me that they are completely incapable of making a coherent story more than a paragraph in length, but I can dream.

What game/series do you wish was expanded upon?