by Vera H-C Chan Alyssa Milano has gone from " Charmed " to " Romantically Challenged ," but there's no love lost with critics. In fact, there's not much love at all for her new ABC sitcom debuting April 19. Aside from a few guest spots here (" My Name is Earl ") and TV movies there (" Wisegal "), the TV actress hasn't had a regular primetime gig since 2006, when she stopped fighting demons and warlocks for the WB. Milano, a perennial Web favorite (she's in the top 3,