The game was revolutionary at its time. Even though a lot of development team's solutions are strange or straight up stupid (Altaer's abilitiy to kill from above by jumping on a templar and stabbing him with a hidden blade is restricted in the beginning), stealth mechanics lack deepness, the game is great at building a fantasy of being a fast and agile killer, hunting for its prey. And i like the fact that there are no cutscenes in the usual sense. Dialogues (excluding the ones with Al Mualim and the guys at the bureaus) and Templars scenes are seen from Altaer's perspective, which helps immersion. Mastering parkour is also a pleasure.