In MGO ONE shot to the head meant dead. MGO3 is really good, but I would say the jump from MGO to 2 wasn't that drastically different. This one is.
The Scout is the hardest class to use by far. The Scout is not a Sniper, otherwise the aim wouldn't sway back and forth as it does. I get most of my points from marking enemies with my binoculars and using e. locators -- taking shots at my opponent when I can. You are probably better off using the assault rifle in most cases. They have night vision, and this helps very little actually. I can see most infiltrators anyway. Most people do not know how to use this class properly.
Infiltrator is my least favorite class to fight against, and to play as. They are the runners in this game because of that active camo. A smart infiltrator will flank, and a dumb one will run to the middle of the map with the active camo thinking nobody can see them. They have a wide array of weaponry and gadgets though. I unlocked the Fulton Trap just recently, and if an enemy runs on it, they are gone unless a team mate is close by. They also have stun grenades. These grenades are tough to deal with, but if you have a box equipped you will be free of getting stunned/blinded.
My favorite class: The Enforcer is starting to be used a lot more now that people are over the sneaky aspect of the game already. They have LMGs and it makes the difference. Their armor is tricky to get through as well, so the best way to kill them is CQC from my experience. You can unlock a sleep grenade launcher. This thing will fuck you up. Also C4 is a valuable tool of the Enforcer. You can actually put it on the D-Walkers, and it's great for defend the comms.
Tips:
- The box can slide like in campaign. This is great if you know your character is going to be slow.
- Night Vision is pretty useless. It could be a lot better. It's best bet is a sand-storm.
- Getting in the D-Walker at the beginning of the match is a smart move. It makes the enemy think you are going to gun it, and you just might get a killing spree early on.
- Petrol grenades are great against Enforcers that use shields.
- The Scout can plant mines, and this is great for Defend the Comms -- just make sure you don't blow up on your own mines. A suicide is brutal in this game and will take 300 points, which is three stuns or two kills.