So I'm I Kvatch to take out a target. Look around. No guards nearby. Isolated. Take down target with blade of woe.
Boom. A guard is immediately hitting me like he just dropped out of the sky. WTF. O.o On the plus side, I managed my first escape from a guard on this character for the achievement.
I go back in later and other players are slaughtering the whole town and the guards are just derping around blind to it all.
I guess I'm not getting the stealth rules in ESO. I also seem to get caught a lot in restricted areas even though there was no line of sight. I dunno... I just did successful stealth runs of Deus Ex and Dishonored, so maybe I'm expecting the wrong mechanics here.