How can you "ban" critics? They have as much right to their free speech and expression as do you. ( That's the liberal in me!)
You are NOT required, however, to pay any attention to said critics. As was pointed out above, they seldom have a direct effect on the success or failure of a movie. Word of mouth is much more compelling.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags