ive noticed this "problem" as well and the response to it was rude...but the more sniper matches i played i noticed that it did seem to just take some adapting to get the sniper "working" again. i think it may have to do with shields. i noticed when i shot the person in the chest and brought down the shields i could pull off an instant head shot right after. but if i aimed for the head first it took two or 3 direct spot on hits. i think it was made more difficult but if one person has a semi bad connection it can take a good 4 or 5 shots to the head to kill but then sometimes on a local or lan game a direct hit doesnt kill a stationary person....so i think that sniping is harder but there is a glitch as well.