Yeah, 2 was pretty unforgiving and I liked the changes made to disguises/NPCs in BM to make it more obvious when you were in a place you shouldn't be. I know a lot of people that love the idea of Hitman but were previously turned off because of how damn hard the older ones could be.
But BM did overkill the difficulty easiness in some ways. Like mentioned on the last page, the chloroform rag in 2 was great. Use the entirety of it to take out a guard for the entire level, or split it for multiple uses knowing it's going to only last for a specific amount of time before the guard reawakens. The sedative in BM lasts forever and is essentially just like killing a guard, and even more abusable was the human shield. Take out a silverballer, human shield, knockout = same thing as a sedative, but with no limit for use. You can knock out entire levels like this. In a way I don't really mind that due to my playstyle, I love fucking around in these games, but I can see why changes like that would bother people since it made SA ranks easy.
Absolution seems to be making the BM disguise system less abusable('best' outfit in a level doesn't equal full safety anymore) but who knows on the rest.