9/10.
The good:
- Camera (compared to Galaxy Nexus)
- Screen colours + accuracy
- 16:9 aspect ratio
- Speed + graphic capabilities
- Battery life
- Siri while driving
- Loudness of the speaker (something that really irritated me about the Galaxy Nexus was how quiet the speaker was)
- Aesthetically very pleasing
- Google maps turn by turn

(I've been led astray a few times by Apple Maps but never with Google Maps)
And finally, my favourite feature of all - iCloud integration across my iPhone, iPad and Mac. The calendar, notes and reminders syncing across is insanely useful to me.
The bad:
- Potential scuff gate but doesn't bother me too much. I'm going to be using this for 2 years and I expect it to pick up a few marks here and there.
- Non user replaceable battery
- Non expandable memory
- Not all apps are iPhone 5 optimised
I knew about the bad points before I purchased - they are more irksome than full on annoying.
So far, I've been very pleased.