He really liked the English, I see...I've found it contained in a grouping along with the above authors (and more).
"France has not insults, fool’s-caps, and pillories enough for such a scoundrel. My blood boils in my own veins while I speak to you about him … And the terrible thing is that … it is I myself who was the first to speak about this Shakespeare [in France]. I was the first who showed to the French a few pearls which I had found in his enormous dunghill."
Voltaire in a letter to D'Argental
I suppose I'd have to dig up the article to find out how he arrived at that conclusion.2.
"With the single exception of Homer, there is
no eminent writer, not even Sir Walter Scott,
whom I can despise so entirely as I despise
Shakespear [...] . The intensity of my
impatience with him occasionally reaches such
a pitch, that it would positively be a relief
to me to dig him up and throw stones at
George Bernard Shaw. Edwin Wilson edition (New York: Arno, 1980), pp. 54, 56.