Unfortunately the Elder Scrolls games are like one amazing game shattered into five pieces and each piece encased in crud.
Arena has the tight gameplay and game balance, and a complete world.
Daggerfall has the sprawling epic content, and the metaphysical grandeur.
Morrowind has the writing, mood, culture, and story.
Oblivion has more living towns and NPC behavior and the right magic/combat/thief mechanics, and introduced good graphics and physics.
Skyrim has dragons, I guess.