Ben Stiller actually does a great job in this one. Noah Baumbach has such an unusual way of making people's ordinary lives and dynamics interesting. This is no different. Stiller plays the quirky New York brother of an upper middle class LA man. Stiller, fresh from a mental hospital, housesits while his brother is in Vietnam on vacation. He becomes involved with Florence, played by Greta Gerwig, who is his brother's assistant. She is also unusual in her attraction to this odd, relatively unkind man, but she is really, really likable in this. It is, like all Baumbach's movies a look at relationships and people. Stiller is horrible and great in this all at the same time.