To say that "Kickboxer: Retaliation" is the best film in a 29-year-old martial-arts franchise in which you can feel your IQ points dropping faster than a pebble tossed down Niagara Falls may be damning with faint praise, but it's praise nonetheless. A whirlwind of feet, fists, swords, knives, chains and cleavers, "Kickboxer: Retaliation" is like a roundhouse kick to the face for two hours. And, yes, that's a good thing. Director/writer Dimitri Logothetis wisely ditches any pretense of getting his characters to act - star Alain Moussi, a Canadian stuntman and martial-arts pro by trade, won't be striding the Oscar stage any time soon - and just keeps the fists of fury flying.