There is a problem herein that A perfect assassination has taht pesky 30 second achievement, which, while certainly possible in those layouts, has the trickyness of the randomized walk patterns. hell i had the target be crowded with guards once before till the time RUN OUT.
Ifyou gonna make a game about assassinations where your only tool is avoiding/cloaking through Line of sight, then your assasinations sould not make you leave behind bloddy footprints, also, the 30 second achievement should be a bragging rights thing, like have 3 objectinves award you a perfect assasination, and if you get them AND 30 seconds, you get an "Attention to detail" medal for the mission, as with some patterns it takes replays.
I dont mind the fact we cannot knock out/ kill guards, a good assassin does not create collateral damage, and incapacitation is not easy anyway.
Tho you should have more responce to contracts than running in and stabbing them, its obviously beyond the scope of this, and the lack of a ranged weapon does not bother me, but it does botehr me how you swim in your victim's blood, i mean even when i gently nudgetsab and immidtatly back off i still ahve blood on my soles. there should be an option to kill them less... messily, if a player would like to spend a bit more time dealing with there target.