That's a rather extreme statement. There is no reason why problem-free discs ripped to ALAC by iTunes using error-correction couldn't be fine. And what matters is what you play them back with, i.e. MDMS or iTunes with an unoptimised output.

I have some rare discs which I can't get error-free XLD rips from but have no choice but to use what I can get. Despite this, they still sound much better on my MDMS system than out of iTunes and the Mac's unoptimised output.

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