I completely disagree. I don't see how Oblivion didn't feel more expansive or real than Morrowind. Oblivion felt like an actual living world and the graphics and music added to that feeling. Morrowind was great but it did not invoke a feeling of a real, living, breathing world. As for what the guy you were quoting was saying, there was less exploration in Morrowind than in Oblivion. There were far more dungeons in Oblivion and most of them were more expansive as well. None of them looked the same either. If Oblivion's dungeons were cookiecutter then so was Morrowinds.
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Oh right, you ain't kidding?