You must have better dexterity than I. Strength mode was too risky for me. I "sniped" in so much as that I would decloak, shoot, recloak,
relocate (usually to behind a bush), decloak, recharge, recloak, rinse and repeat. Sometimes a grenade would find me or I'd stumble into a Korean I didn't see and then things would get really interesting really fast, and those for me were the best bits of Crysis - when my plan failed and suddenly I had to think fast and improvise. One of the things that Crysis does well is provide the player with a lot of options for improvisation!
