While it's really a matter of personal opinion about these matters, my biggest gripe about the case (as with the Apple leather case) is the price. If it were a more reasonable $29, I'd say it's great. It's not really a protective case at all as these go. Black is the only one that will look good over time as the lighter colors will garnish a patina appearance that some may be OK with, like leather gloves as they break in.
This phone has a large, protruding camera bump unlike any other device and presents a challenge to design a case that can adequately protect it and not feel like a brick! Imagine if they made the entire phone thick enough to house (the camera hardware) and have the camera aperture window assembly perfectly flush? 8000mAh battery anyone?
Of course the "anti thicc" crowd would be quite vocal about it.