Nostalgia is clouding your judgment . guards in thief 1 and 2 were dumb as rocks
To be fair, it's not like Thief II's AI were geniuses. I played through that for the first time a month ago and some of the AI were absolutely brain dead.
Just to set the record straight, I only played the original Thief last year. Haven't played Thief 2 yet. So that nostalgia argument goes outside the window.
Secondly, this is a direct criticism to the developers intention of
dumbing down the AI and at no point did I make any comparison to the "old" games.
Stealth game AI has to be bordering on braindead or the player would never have a chance. Predictable responses, moving in search patterns with obvious blind spots, lack of meaningful coordination other than mobbing the player when spotted, dull senses, inability to look up and extreme short term memory problems. These are tools of the trade for stealth AI design, and thief is not totally innocent of similar crutches.
To be fair, AI is just all smoke and mirrors. Regardless of how "intelligent" they are, there would always be a blind angle to their instructions.
Let's use Thief as an example:
Thing is, you can have "realistic" AI NPC's that will hunt you down or exhibit tracking ability. But this is where you as a Thief come into play. You have tools of either deterrent or an emergency box (smoke bombs, rope-arrows). No MATTER how good an AI is in the game, he is only limited to what his agency allows.
A normal guard shouldn't be as fast, agile as the "thief" player, meaning you can "break" the AI by utilizing every tool you have at your disposal which is why player-agency is required for simulation type of games.
You can create a variety of NPC's to make up for the disadvantage of one. This forces the player to adjust their tactics on the fly instead of relying on what they're accustomed to. Imagine the AI scenarios that can do what other NPC's couldn't and the combination of both (possibly) can push the player to do drastic attempts to get away.
Thing is, if you're just "Man-who-wants-to-steal" type of game, then I can understand the realistic AI criticisms. But you are a thief - a master one at that. Which means you have skills and abilities that counter any normal, so-called realistic aspects of the game.
It's just talentless developers who don't have have the vision or talent to push through these type of experience that's the problem. If only games weren't restricted by budget, we may actually see a proper evolution of the Thief franchise.