My front door has a large window on the top half. It's pretty and adds some interest to the door. But it also adds a question of window treatment and privacy.
When I first purchased my place, the door had an off-white (or dirty... hard to tell) honeycomb blind. Functional: yes. Attractive: noooo.
Final result (it is only fair to disclose that the entire door also received a fresh coat of white paint):