Indeed. I have now disbanded my sniper class for good. Too unpredictable. I don't know if it's my connection or what but I would say in the day about 6-7 out of 10 shots that SHOULD be one hit kills (chest/head) ARE one hit kills, the rest are hitmarkers or shots not registering at all.
From around 10-ish in the evening it is more like 3 out of 10 of them are.
It's a similar story with shotties, late evening it can take up to 5-6 shots at point-blank range to drop someone but of course by then they usually kill me first.
In 3ish hours I managed to level it up to 25 and those 3 hours were probably the most fun I've had since cod4. I got robbed of a lot of kills but even then I was still having fun with it.