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An interesting thing to note there is that research shows that untrained individuals have significant variance in task performance which decreases as they get better at the task. Mechanical Turk might be an extreme case, since all tasks are done by untrained individuals.

Whilst I agree with the quote that AI has difficulties when moving away from well-defined tasks, so do we. Most expert performance is constricted to narrow task domains, does not transfer well to other domains, and takes a long time to acquire. In a sense, that's not too dissimilar to AI.

I do disagree with the "simple". Games such as Chess are the stereotypical example for things AI performs well in. Their rulesets are well defined, but the games are incredibly complex. It is amazing that AI outperforms even grandmasters in this area.