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yeah... I get it... I could still see which part was bigger.

The purpose of a pie chart isn't to show which is bigger (which is much easier to convey in text), but to give relative proportions.

So could you accurately estimate the two sizes? Research suggests you'd be better off with a bar chart than with a pie chart except in certain cases (25% vs 75%) and that isometric pie charts are worse than flat ones.

It would be just as trivial to create a 3D bar chart that has the same effect as the example (accurate, self-referential, and confusing because of the color/label mismatch). While clever, this example isn't an indictment of pie charts, because it clearly shows the relative proportions of two quantities (as would a bar chart).

There's two different links in these comments that explain at length why pie charts do not clearly show relative proportion. This is even less true of 3D pies.

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