I picked up a copy of The Elder Scrolls III: Morrowind (with the 2 expansions) and The Elder Scrolls IV: Oblivion. Then I decided to hunt down and collect The Elder Scrolls I: Arena and The Elder Scrolls II: Daggerfall, just to say I have the entire series of the game, LOL

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I haven't even tried it yet. I've heard that the graphics are absolutely astonishing, and that the game is actually quite difficult. It is very in-depth, and sucks you right into the story. Another great part of the game, is the ability to cross your characters between several feats & characteristics.
I'm eager to get into the games, but want to finish F.E.A.R. / Doom3 / Quake4 first.