Duplex is a film that baffles me, much like another Danny Devito dark comedy, Death to Smoochy. He has a way with dark humor and I loved it in War of the Roses. In Duplex, it doesn't quite work all that well though. I love the premise, but it was just missing something. The old lady is a really good character, but I don't think she's used as well as she could have been. This could have been amazing.
Alex and Nancy are a happily married couple. Alex is a writer, who is currently working on his second novel. Nancy is a journalist. They find their dream home, which happens to be a Duplex. One problem though, there's an old woman living on the second floor. Alex and Nancy think she's going to die soon, so they grab the place, believing she is a sweet old woman. A lot of back and forth goes on and it turns into just another escalating bullshit driven comedy, which is sad, because I enjoyed a lot of the details put into the story, just not the character interactions.
All in all, Duplex is nothing more than an average comedy. Ben Stiller and Drew Barrymore play pretty much their same film personas. I happen to like them both, but for people who aren't fans of theirs, this is definitely not one to watch. It wasn't a complete waste of time for me. It had spells that were really entertaining and hilarious, but they were too few and far between.