The only thing Apple has done since the original iPhone is refined it, cut off excess fat, streamlined the design, added storage, added processor speed, added cell speed, and increased the screen resolution. None of these were completely mind blowing and revolutionary changes, they were incremental improvements. Yet, that is only because Apple got the design of the original iPhone right, they nailed the fact smart phones in the next decade will be large touch screens with minimal buttons.
Remember that as you type away furiously about your disappointment. Seriously, what did you expect?