Yeah, compare Blood Money's AI search/awareness routines with AP's, where a helicopter circling the area will alert everyone to your presence, despite the fact that you're behind cover. Compare the suspicion-o-meter with AP's "guard finds a corpse, gets mildly suspicious, forgets about the whole thing ten seconds later" system. Oh, and hey, I guess moving corpses out of sight and ****ing closing doors is way too much to ask in a game where stealth is supposed to be a valid way of beating most scenarios. Who cares about that anyway? You have The One Ring!
But yeah, in AP enemies flank you and have unlimited grenades to drag you out of cover. I guess in that respect, AP is better. Dialogues and characterization are better too. A shame that all of that is irrelevant wrt the points I was discussing, don't you think?
So I guess you don't remember Hitman's AI is suspicious of you so it shoots you down. The suspicion level meant that if you ran or went the wrong way the shooting began. Or all the other erratic AI behavior, I think there are better examples out there than Hitman.
PS. my guards never got mildly suspicious, they did a sweep of the area or called the alarm.