In reality there is no kind of evidence or argument by which one can show that Shakespeare, or any other writer, is "good". Nor is there any way of definitely proving that--for instance--Warwick Beeping is "bad". Ultimately there is no test of literary merit except survival, which is itself an index to majority opinion.
George Orwell, In Front of Your Nose: 1945-1950
literature, merit, opinion, shakespeare, taste