It depends really how you want to do it. In Battlefield they are underpowered with their odd long range accuracy and difficult to gauge bullet drop along with a near 3+ body shot kill(It should be at least 2 on bolt actions and this is ignoring realism). In games like CoD they can be overpowered with the way to scope works. Stuff like TF2 is a good balance as you have to hard scope for the body shot kill and only on some classes although apparently that makes me an unskilled noob for doing it while I get used to trying to learn to snipe TF2 style but screw those people.
CoD 2 and beforehand also did it quite well as the hipfire accuracy was laughable at the best of times making you need to use the scope. Personally, they need a full redesign.
Although as already stated if a game goes for realism or pseudo-realism is it more than acceptable for them to be 1 hit kills as most modern snipers tend to do just that and the chest area has many vital or near vital organs that can cause you to easily bleed out quickly.
CoD 2 and beforehand also did it quite well as the hipfire accuracy was laughable at the best of times making you need to use the scope. Personally, they need a full redesign.
Although as already stated if a game goes for realism or pseudo-realism is it more than acceptable for them to be 1 hit kills as most modern snipers tend to do just that and the chest area has many vital or near vital organs that can cause you to easily bleed out quickly.