Unless the director was Alaine Robbe-Grillet, who directed Last Year at Marienbad.
But I don't think so (I don't really believe in using the term "pretentious" in criticism anyway). The filmmakers were trying to accomplish something new, and use a new style, but that doesn't equal pretension. The question isn't what their motivation was in making the film, but whether they succeeded at making a good one.
And I am torn. The "story" is, at best, difficult to grasp, and there are many questions left unresolved (like whether any of the memories have truth to them at all.) The acting is, at best, unrealistic-- which is probably done purposefully. I guess I would just have to say that I am not used to this style, and don't know that I will. But I am glad for the opportunity to watch this famous film. Now I will have to take some time to think about what I really think about the film.