Design: Much like the MBA and iMac Apple decided to stay conservative and stick with a design which is still modern. I don't think it looks ugly by any means, but to a degree I wish Apple had done something different.
Display: Still beautiful even though it was unchanged from the iPhone 4. For a 3.5 inch screen I have absolutely no complaints about the resolution. I do think that Apple needs to increase the screen size with the next iPhone.
Cameras: They were the main reason I picked the iPhone over the Nexus. Stunning for a cellphone.
Reception: Not the best on Sprint but still good.
Performance: Speedy and responsive.
Software: iOS is getting boring and stale. Siri is really overrated until it gets more thorough integration.
Battery Life: Good, and it lasts an entire day easily.
Ecosystem: Still has one of the best.