Assassians Creed Brotherhood online tips?

I am currently level 50 in this game online and am somewhere in the top 2000 players of all time score on the ranked leader boards on xboxlive (inb4 no life) I mostly play manhunt, so i use a disguise poison class for offense and a mute smoke bomb class for defense, and i stunbox/stunspam with my friends a lot. however i am wondering what tips people are using to spot their targets, other than the obvious running on roof etc. I mean little things that you use to spot people. i use a couple myself like minor animation glitches, but i want to improve my game a bit more if possible and see how others play. If possible, i would also like to know how to dodge assassinations. Many people say its impossible, but i myself and others have done it before (me accidentally) and have gotten kills and stuns out of it, without a smoke bomb.