You can't put German and Dutch salaries in the same categories as Spain and Italy. There's easily a 50% difference.
German salaries are really attractive for Europe.
It still sucks compared to US.
Even after taking out cost of rent, cost of living and cost of healthcare? I highly doubt that.
Having worked in both places, yes, they still suck in comparison.
In absolute numbers German pay may suck, but once you factor in lower rents (e.g. in Munich a 60 m2 2-br flat in the city center will set you back ~1200 €), lower healthcare costs (no co pays aside of 5€/Rx, no "out of pocket" costs for medically indicated procedures), a decent pension scheme and lower cost of food and other expenses, suddenly it is competitive.