POP ART: Episode 10, Aliens/Attack the Block

Are we alone in the universe? If not, will they come with a bang or a whimper? Sounds like time for Episode 10 of POP ART. The concept of POP ART is for my guest to choose a movie from popular culture and I, in turn, will choose a film from the more art/classic side of cinema. For  Episode 10  my guest, screenwriter, film student and facebook host Mark Gunnion, has chosen the James Cameron horror/sci-fi blockbuster Aliens, while I have chosen the urban horror/sci-fi independent film Attack the Block, both about people fighting off deadly aliens.  And here we talk about: What is the major plot flaw of Aliens? Which movie has the better screenplay? Is Aliens all about mansplaining? Where did Alien 3 go wrong? And how does Dr. Who fit in?  Is it game over, man, game over?