This game is amazing, sure it might not have the best for replay value other than trying to beat the game as quick as possible or taking new routes and trying new tactics and etc. The game runs like a charm and not once did I even find the slightest technical bug or hiccup. The guards are my only "qualm" if you can call it that. The guards are at times just laughably easy to avoid, just sprint through the outer edge of the cone of vision and exploit that cone as much as you can and you'll barely have a problem. The guards are also easy to take out too, just wait for one to pass by the corner you've pressed yourself against and just grab them and drag them in, another thing that works is just running up right behind them and mashing the space bar. I also love the nod to the original game, the original stealth hunter against the wall and the guard standing dangerously close to him, just hope he made it off the island!
I also love the secrets you can find, including the room that gives you the assault rifle a few stages early.