Milo Ventimiglia, Chrissy Metz, Susan Kelechi Watson and Chris Sullivan all shared their favorite lines from the series’ six-year run Fans have long-raved about the powerful writing on This Is Us — but now, the cast is also getting in on the fandom. During the series finale screening and panel on Sunday, Milo Ventimiglia, Chrissy Metz, Susan Kelechi Watson, and …