Some people gripe about how the 911 has stayed true to form for the better part of half a century. Personally, I'm very okay with that slow evolution. Let's go further: I think it's wonderful. In a world of passing fads, this kind of organic change is something to be celebrated.
Beyond that, I love how 911s remain so unappropriated. It's not even that no one else tries to copy the shape; no one really tries to copy the details of the shape, either. That beautifully smooth ellipse of a rear window has persisted from Ferdinand Alexander Porsche's prototype through to the present day, and no other car in the world has it. It's a fingerprint. At a time when wannabe-Hofmeister kinks are showing up like dandelions, it's a small but perfect act of design individuality.