rigid monolith
Everybody pre-ordered the game as they were promised a huge open-ended sandbox stealth game. Not for a linear 4 hour long, "hold shift to run away from guy" simulator with "Triangle go in triangular hole" puzzles.
If you ever decide to add meaningful content expansions with new areas and characters (Which may or may not be another empty promise) add the open world format to it where you must experiment with physics, tactical approaches and close quarters encounters with dangerous enemies like what was expected from this game at launch.