Yes, but like the junior says:
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They could free up the game and make it a sandbox like Chaos Theory, that's fine with me. What isn't fine with me is the fact that killing people willy-nilly with a knife or gun or something doesn't make enemies wear Kevlar, stay in groups, stay in the light... get smarter about a threat that is coming. Basically punish you for going that route instead of the stealth route.
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Again: CT isn't a bad game and I enjoy it for the sandbox. But I loathe what it has done to the series in regards to stealth going out the window and just being "window dressing" to classify the game as a stealth game when most people probably aren't going to play it that way.
First of all I must confess, I never used the knife in Chaos Theory. When I accidently did it, I reloaded.
But, if I remember correctly, you could take enemies up front, non-leathal, if you could survive them calling for help or firing at you.
I always felt it would be easier to stay hidden, so I did. But I also tried to knock out every guard. I'd never occured to me, that I could beat CT, without staying hidden, so it is still a stealth game to me.
But yeah I agree, guards should be harder. If you take out somebody, the others should wonder where he is. And if you are spotted, they should change their tactics completly, either hunt you down, or guard the Macguffin.
But in that case it would be no use to go on, and the game should trigger the loss condition immedeately.