This phone's been reviewed to death so my thoughts:
-display SHOULD be bigger, 4.0" would be grand.
-battery life is dependent on apps. not possible to tell which apps on iOS (that i know of)
-SIRI was at about 75% accuracy/availability earlier on. i believe the quality of the transcription has gotten worse over time, i would say it's at 60% which means i'd rather not risk using it at all.
-same old exquisite but vulnerable physical design
-like all other phones, the phone gets slower with prolonged use. What used to be instantly available camera, i often miss quick opportunities.
-i guess im a little OCD but i hate the folders implementation, it's so... manual and generally unpleasant.

anyways, i think i could go a little further nitpicking but generally this is a very very good phone, especially at the artificially low price of 199 as compared to other high end phones.