Luck of the draw.. Your phone just landed in the wrong orientation.
I've had my N4 since release and I've dropped it quite a few times on wood and concrete and it's still mint. At least one or two of those was pre ringke slim case. The reason I got the case was the first time I slammed it into the subway turnstile while it was in my pocket.. Figured the back glass needed a little protection from that seeing as I go through them at least twice a day 5 days a week. Bound to happen sometimes.
I doubt I'll be buying a case for the N5 since it's plastic backed again.
Nexus 4 16GB + Rearth Ringke Slim
N4 Bumper: In storage
GSM Galaxy Nexus 16GB: In storage
GSM Nexus S: In Storage
T-Mobile G2: In storage
Nexus One (T-Mo Bands): In storage
T-Mobile G1: In storage
HTC Tilt 2: Trashed
Nokia E61i: In Storage