I personally think Lord of the Rings inspired Oblivion and its successors. Before LoTR had a chance to influence the market we got fantasy games like Morrowind, now we get horribly generic games like Oblivion, Two Worlds, most modern MMOs, etc. You could argue that "generic fantasy" is a result of the decades old recycling of the LoTR book themes, but before the Fellowship of the Ring was released it seemed like fantasy games were really unique and diverse.