Are all the Airbus A380's 16 exits designed for everyday use?
None of the 16 exits are hatches. All 16 have identical operation. From the A380 FCOM:


  The aircraft has 16 passenger doors (...) The doors open forward. The opening/locking of the door is performed mechanically by moving the door handle. In normal operation, the door revolves electrically by pressing the OPEN pb, or the CLOSE pb. In emergency operation, the door revolves automatically. In the case of an electrical power loss, the door can be manually operated. There is a flight lock actuator in each door that locks the door handle during the climb and descent phases, in order to prevent inadvertent operation during flight.