Not reading the topic, as I only played 15 minutes or so before going to sleep, but I did find some C4 and blow up an AA turret.
But, because I didn't know how to trigger it, I ended up putting down a C4 brick at a second place. After this, I managed to get the 1st one to blow up.
Later, after getting to another AA Gun (that's a good ways from the 1st), I set up a 3rd C4 brick on it, and get slightly spotted. I run off and hide in a bush, as one guy starts searching around the AA gun. Feeling this is the best time to set off that C4, I hit the trigger, only to have the previous misplaced C4 go off, way in the distance. This actually works really well, because the soldier, and 3 of his nearby buddies hear it, and it actually brings in those other soldier's closer to the 2nd AA gun (as they are about to go searching in the direction of the 2nd C4 Brick explosion).
They ended up to close to the 2nd AA gun, and died when I set off the 3rd C4 brick.
Anyways, game runs nicely, Snake has fluid movement, and from my short playtime, it's not bad.
Will see how replayable it is later.