Every online console title has that. It's called "lag". Look on the bright side; at least you don't shoot someone for 20 minutes only to have them suddenly teleport behind you and shoot you in the back of the head.
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Actually, one thing on your list is already confirmed. HVS has confirmed the existence of a sniper. Personally, I think the Strike Rifle works great as a sniper, as does the Scar. A good head-shot with either one is a one hit kill.
"There are two things that are infinite; The Universe and the stupidity of human beings. I'm not sure about the first." -Albert Einstein