Everybody new to far cry mp regardless of fps experience gets royally owned. At first you will think everybody is cheating but you. Remember people have had this game for quite a while now and many people play religiously. The good players are very good. Stick with it. It will click for you.
I do hope you are remembering to go prone with that sniper rifle Pelezo. Earlier today i had a jack carver standing up and trying to shoot me with one ,he left after i put him out of his misery a couple of times with an M16. I do hope it wasn't you .
Seriosly though ,the sniper rifle is seriously bugged . I often get hit and my screen flashes white but i take no damage ,or i get left with a little health and the next hit doesnt register . So you might have been hitting more than you thought but its not an instant kill ,plus the lag makes it a very difficult weapon to hit moving targets with .
You also have to remember that if you are stationary a good player will take you out in a very short period of time . Looks like you need a little more practice mate before you judge the game .
while playing today on one server they dropped with one hit with snipe rifle, and another server i was playing it was taking atleast two, even if it was a headshot. Prone is the best way to go for aiming atleast try crouching.
I don't think it's the sniper rifle that's buggy, has much has it is teh netcode. I'm on the east coast and when I play on West Coast servers, I get that alot. Normally it's me getting the red screen but no damage. I've also pumped 3-4 rounds into people, saw the blood spurts and the body flench, but they never dropped.
To me it seems, a person with a 15-20 ping will have trouble with someone with a 50-70 ping and vice versus. At times, I really think the netcode sucks