FOXBORO - Bill Belichick rates the Baltimore Ravens’ defense as must-see TV. ‘‘If we didn’t have to play them, it would be fun to watch them play on defense,’’ the New England Patriots head coach said of the team his unbeaten squad will face at M&T Bank Stadium tonight (8:30, ESPN and Ch. 5; WBCN-FM), ‘‘but we have to play them, so it’s not too much fun.’’

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