I loved them all for different reasons, mainly Skyrim and Oblivion. I felt that Oblivion's quests were infinitely better ([i]especially[/i] the Dark motherfukin Brotherhood ones) and I'll take Ayleid ruins over Dwemer ones any day, but I love the exploration of Skyrim and all the little things it does to compensate for some of its missteps in the quest department. Solstheim is amazing too.