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Civ V's two expansions make an underwhelming game quite excellent, especially if you're playing a Culture, Diplomatic, or Science game.
As for Oblivion, Shivering Isles destroys the main game. Hilarious writing, interesting quests, and gorgeous visuals that trounces Oblivion's cheesy writing and generic setting and landscapes.
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MMOs are probably cheating but the FFXI expansion storylines, jobs, and areas were a lot cooler than the originals (with the exception of Windurst which has always been the best city).
