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i think you should look at it from the following perspective: why do people keep playing morrowind despite its flaws? and, nostalgia CAN NOT be in your mindset.
That's like saying that people who still listen to Jimi Hendrix aren't allowed to experience any kind of nostalgic feeling towards his music, whether they were alive at the time or not.
Morrowind was an original so those who defend it as a near perfect game are like Hendrix fans who were teenagers or young advlts in the 60's.
Oblivion is like Yngwie Malmsteen. Technically brilliant but kind of cold and just "missing something".
Skyrim is something of a hybrid of the two, mixing feeling and technical excellence. For that reason alone it's going to take heat from the purists of both Morrowind and Oblivion.
And then there are others who whine and cry about everything no matter how great or crappy a thing is. Those are Devo fans.