Owen Gleiberman Chief Film CriticIt’s always a kick to encounter a documentary about a subject after you’ve seen the deluxe scripted and acted Hollywood version. “Lucy and Desi,” Amy Poehler’s film about Lucille Ball and Desi Arnaz — their love, their showbiz partnership, their revolutionary influence on the creative landscape of television, their meshing and clashing spirits — is a nimble and fascinating documentary.