Halo 2 > Halo 3 > Halo 3 ODST > Halo Reach > Halo CE
Based on campaigns.
I seriously CANT snipe. Not just in Halo, in all shooters I play, I cannot snipe.
A while ago, I suddenly became reasonably good at sniping, I was getting quite a lot of kills. Now, I just cant do it.
So to any good snipers, any tips would be very much appreciated :)