Rachel York doesn't look or sound a thing like Lucille Ball, and one's heart goes out to her as the script for this ''three-hour movie event'' falls prey to the usual biopic mistake: recreating famous scenes. Thus, York (left), doing ''I Love Lucy'' classics like stomping grapes and cramming her mouth in the candy factory, comes off forced and unfunny. But her performance is touching nonetheless, especially when Desi Arnaz (a too-thin-for-Ricky-Ricardo Danny Pino) does her wrong by womanizing and gambling. But the rest of the story you've seen 10,000 times: A struggling performer triumphs over a tough childhood to become rich, adored, and needy for love. You can watch ''I Love Lucy'' in syndication and have a much better time. C- --Ken Tucker