Like all of Kundera's novels, Identity is sure of itself. There is no confusion about what it means to address. It's about the crisis of identity- or rather his romanticized perception of an Identity crisis. The story is sparse, as is in much of his work. Everything's that's told has already happened in the characters' pasts. Nostalgia is a powerful engine in his novels. They begin in the present and then tread the timelines of the past and those of dreams, and then they converge on the present again. Identity is no different in this way. But one really can draw comparisons of the complex sorts with his other works. The idea, the theme in each of the book is ingrained into the characters and their actions and it renders them unique in their rejection and submission to conformist lives.
Identity doesn't really stand out in his oeuvre. It stands among the others and for a writer like Kundera, that really isn't enough for the readers. As a Kundera novel it's a 3.5, but in general its a solid 4 stars.