Here's another of MGS4's greatest achievements.
The fact that, everytime you die, or get spotted. It is YOUR fault. What I mean is, so many other games always fail you because of a silly bug or a design decision, GTA can come to mind for cover system being a bit clunky for example. Some bits from the story mode on GTA4 did frustrate me because of this, and to me it's a big negative if the game lets you down in that way. Ninja Gaiden 2 for example, you could say it's the camera. I mean i'm giving examples of games I recently got so. Mario Kart is a very good example of this, seriously unbalanced.
With MGS4, it requires a great degree of skill, patience, and being aware of everything around you. I am ofcourse mainly talking about the harder difficulties, because they are also the more realistic. For example, I'm crawling around in act 1, camo index is 85%, two guards infront of me. So I think, wait for them to walk off, continue on.. they walk off 20 metres ahead, I completely ignore this vase next to me, and I knock it without a care in the world... Aleady they run back, see me, and it's my ass.
Just love that attention to detail. Gameplay for me is absolutely flawless. Also, the variety is absolutely brilliant. Beginning of act 3 is a true test of your stealth skills. I think it was deliberate just incase some people thought they could complete the game by simply running and gunning.