To understand how well-developed the game is, just look at the list of achievements. Completing the game without using runes, without killing, without getting noticed by security is a real challenge for those who are tired of corridor runs with QTEs and other “innovations” that migrated to us from consoles.
But there were also serious concerns. The concept of Dishonored is not new at all - the developers simply combined the strengths of the best games in the stealth-action genre, while simultaneously getting rid of their shortcomings.