Liam Lacey in the Toronto Globe and Mail figures that "the writers must have handed in a rough draft of the script, with lots of blank places between the dialogue where they wrote "Insert really funny bit here." And then they went for a long lunch."
Chris Vognar in the Dallas Morning News calls the movie, "a high concept knocked down to its lowest possible intelligence level."
And Jonathan Foreman in the New York Post calls it a "cheesy, cheap-looking update of A Connecticut Yankee at King Arthur's Court. Calling Lawrence "the Stepin Fetchit of our age," Foreman writes that his character is "a shiftless, mugging, leering, inarticulate L.A. black man who rolls his eyes and ambles around like one of the chimps in Planet of the Apes." Had the film been co-produced by the Ku Klux Klan, Foreman comments, "it could hardly be more repellently stereotypical."
On the other hand, Stephen Hunter of the Washington Post calls the film "slight but highly enjoyable."
And you have to wonder if Kevin Thomas of the Los Angeles Times even saw the same movie as some of his more censorious colleagues. Black Knight, he writes, "is a rip-roaring time-travel comedy tailored beautifully to Martin Lawrence's protean talent. It has more hilarious throwaway lines than most comedies offer up as their best jokes, and it is consistently inspired, energetic and, most important, light on its feet."