Well 9 times out of 10 when I wake my screen, the time is wrong and doesn't adjust quickly. That's if it displays at all sometimes. My list is downhill from there. This fundamental failure is making me either angry or horny. Yea it confuses me.
Then I go onto battery life, call drops, wifi drops and lastly signal blackouts. My Mrs has my old Day 1 iPhone 5 and it never misses a beat. Added to that I'm missing iTunes match and iCloud and I'm on the verge of cutting loose.
EDIT: Lack of "Do Not Disturb" functions also annoying. Sleep is being invaded by the flash blinking for emails or the screen waking to tell me the battery is charged, I'm nearly at the point of shutting down at night.