I've had a very complicated relationship with Joss Whedon's Dollhouse , the metaphysical action series that wraps up its troubled run tonight on FOX with "Epitaph Two: The Return." While I felt that there were moments of genius among the forced procedural element, the convoluted storylines, and gaping plot holes, Dollhouse often just left me pounding my head against the wall in frustration at times. I never felt like Eliza Dushku's Echo became a gripping enough central character to anchor the series, which was always much more interesting when the focus shifted to that of Dollhouse's supporting players like Dichen Lachman, Enver Gjokaj, Olivia Williams, or Fran Kranz. (The latter of which grew on me exponentially as the series wore on.) But rather than shift into a full-blown ensemble, the action continually circled back to Dushku's Echo and Tahmoh Penikett's Paul Ballard, easily the two least interesting of the bunch. (Lachman's Priya/Sierra and