I think it is fairly axiomatic that anything with Philip Seymour Hoffman in it can’t be bad. And if he’s the star and he’s sniffing a lot of model airplane gasoline, well, then, you’ve got a movie on your hands. Pretty much a sex-free version of “Last Tango in Paris” set in suburbia, “Love Liza” has a bare plot and gives PSH an opportunity to show unique stages of grief onscreen. Great cinematography. Also, funny. For a movie about suicide.