An attic hatch door should provide excellent insulation. The roof can get quite hot in the middle of the day. Insulation will prevent the room immediately below the attic from turning into an oven. In the winter, this will also keep the occupants comfortable despite the chilly outside temperatures.
The door should be airtight to prevent leaks. This will maintain high energy efficiency such that the air conditioner and the heater won’t have to work overtime just to chase the temperature settings. This will even help the indoor air quality by avoiding the growth of mold and mildew through reduced attic humidity.
Of course, the hatch door should be easily accessible. Most will come with its own collapsible ladder which the homeowner can use to get up or down at will. This should be sturdy and reliable. It must be rustproof for a long lifespan.