Skyrim was a significant improvement over Oblivion, in every way I can think of. Only Oblivions quest lines were better, but that's not what I go to an open world game for (and I found the extreme mismatch between the cinematic plots and open world gameplay immersion-breaking). And while Morrowind has a much more interesting setting (and the plot weave that encompassed that setting was brilliant), Skyrim was the first entry since Daggerfall to really give me a decent first person action RPG feel.