Got this along with Moon Diver & Both HC:U DLCs. It's kinda like Metal Gear, If it was a platformer and Snake wore a bandana to cover his face while running around and stabbing people from behind.
You can hide inside doors and holes in the floor/ceiling and whistle to get the guards attention to lure them into their grim demise, Hang from the ledge of a walkway until a guard gets close enough to get pulled off and killed, Or you can just run up to the slugs and just cut them up. I'm assuming you get guns later on (As it has stats for various guns, Including an Assault Rifle.), But I didn't play it for very long and switched to MD to see how I'd enjoy the solo run. I think I'll hold onto MD just for Multiplayer though, Unless the other characters are better than Tolby (The first one I chose.)
Anyhow, RNA's a decent stealth game. Aside from a minor annoyance where I can't figure out how to silently drop down from ledges to surprise guards who happen to be underneath me. So far, I found one effective method of taking them out, Just hitting them as you're coming down. XD