Nothing you can do about it. These rules are written in stone :
1-Enemies always find you at the exact moment you're reloading
2-Sprint jump is suicide as the server will lag at this exact moment
3-There will always be a squadmate who will come between you and your target, absorb all your shots and make both of you killed by your target
4-If you play in squad, you'll always be with a Deuce who didn't find any better tactic than camping deep underground
5-Lag gives selective bonus. It will prevent you from moving but allow enemies to dodge bullets like Neo does in Matrix
6-No matters how good infiltrator you are. An enemy random grenade which was not aimed at you is the most likely way to die
Do you sometimes feel this is true ? :-)