When enemies spot you and lose you (map turn yellow) they instantly start to waddle to your location even thou they shouldn't have a clue about where you are. How can Ubisoft, the publisher of Splinter Cell not know how stealth works?
+ The enemies can spot you from miles away even if you are "blending" in tall grass. Why?
++ YOU CAN'T GRAB AN ENEMY FROM BEHIND QUIETLY? When you try to do that, enemies hear you (even if you are walking) and shoot their gun in the air alerting everyone nearby. Whyy...?