I think the automation in Human Revolution makes it a worse game in my opinion, but that is of course because I like games with "low-level" gameplay. The original rewards technical skill.
How much skill does it take to do a takedown in HR, for example? None, just stand somewhat near the person, and you know before the takedown if it's going to be successful, because the game tells you that. Then it changes to a pre-determined cutscene.