I've been trying this out for a while now, and I just wanted to leave an opinion about it.
Say what you will about the other 2 MGOs but they had a certain pacing in the game that is lost in this one. This can be fixed be doing one simple thing: Removing the sprint. It's like putting a full sprint in Splinter Cell's old multiplayer, it just doesn't feel right. There have been too many times where Joe Shmoe Rambo would just come up and spray a group of guys(whether on my team or on the other team) during situations that should be stealthy and tense. I understand that the minimap shows running sounds of footsteps but it's too little too late when you look at the map and the other person is right in front of you. Right now, in most of my games, no one takes cover, no one tries stealth, and barely anyone fultons. Maybe it's different for others out there but what I described isn't Metal Gear, it's your standard Third/First Person Shooter.
I know it's early to judge, so I'm hoping people start using the mechanics better in the future instead of trying to treat this like another game. Right now it just feels like The Last of Us is a better online Metal Gear game than MGO itself.