Except, you know, for the entire branching dialogue/plot part?
Er, what part of Comparing x to y isn't the same as claiming x and y are EXACTLY THE SAME are you not understanding?
It's not idiotic to say that AP shares similarities with other stealth action games, because based on what we've seen it's true. That there is more to AP doesn't change this. Similar does not equal the same.
If people are dismissing AP because they don't think it's individual parts look as good as other games ("Combat isn't as good as Gears of War.", "Stealth isn't as good as Splinter Cell", "It's not a real RPG like Fallout"), then they're missing out, but whining that they don't get it isn't going to change that.