Advice for new players:
1. Don't choose Harec: I know he was the first character featured in the tutorial mission before you went online, and yea, he looks like Raiden from MGS, but don't use him. Why? Because he has very low health and is fragile and you aren't used to the game enough to realize how to use him. If you do, you will be known as the "Baby Harec" and die a lot using up the teams extra lives.
I suggest playing Konstantin, Lycus or Alicia: In that order of availability. These characters are far more forgiving of error than glass canon Harec. NOTE: Harec does NOT suck, but is a high skill character. He's actually one of the best characters *coughBRENTcoughWODDYcough* but takes some getting antiquated with.
2. You Have Special Abilities: This isn't just a shooter, each character has unique abilities they can use. I often see new players not using them and just shooting. Many of you may think the game feels hard, but it's much easier if you use your specials.
3. Utilize Punches, Grabs, and Dodges: If you are in arms reach of an enemy it may be better to engage them in melee combat rather than shooting them an inch away. You have a punch button, grab button and dodge button. Use them and get familiar with them, they are a fundamental part of the game.
4. Names at Death: No that's not another player named Darkeneel'ol, Stinkil'but'el, Sniffydoo'ol, Ltd.Sanchez, Drone evol XT, etc...it's an enemy AI, they have names too. I see a lot of new streams and hear "Are those all players? I think they're players, yea, they have names....wow they suck. I didn't see that character at the select screen, what a dumb name." AI have names to.
5. GET ALEPH!!!!: It's the Spice from Dune, Unuptanium from Avatar, it's what the game is sbout really. And most, not all, missions need you to utilize Aleph in some way relating to the objective. To get Aleph, kill Elite Commanders, Elite Fatties (berserkers), Elite Snipers or enemy players. You will know a target has Aleph if you can see a health bar above their head. Then you use it to do what the objective indicates.
6. Aleph is EXPLOSEVE!!! If you or someone else dies with an Aleph charge then the death will be an explosion. The explosion will damage any allies or enemies near you. If they're near enough, they will dies as well. BUT, don't be afraid, they give you a warning, when you kill an enemy and they fall to their knees screaming and squirming in agony as they begin to glow hotter and hotter with yellow Aleph energy, run away. Stop trying to punch the glowing dying person and run, or you will die next to them. They give you enough time to get out of there. What's out for Aleph explosion trains, one person does in en explosion, the person next to him dies in an explosion and then kills another ally next to them. This happens on elevators a lot. It IS funny though...
EDIT (UPDATE):
7. Invulnerability: When you, or en enemy player, first spawn you are glowing yellow. This means they are invulnerable to damage for a split second. When you, or an enemy player, or an elite AI do a finisher you are invulnerable while doing it. You will notice the same glowing yellow while a finisher is done. You cannot hit or shoot the target who is doing a finisher while they are in the middle of executing an enemy player or Elite AI. They are also invulnerable for a split second after the execution.
SO, when a person is glowing yellow know that nothing you do hurts them. There are a few exceptions to this rule, but I don;t want to confuse you at this point. Just get away from them for a split second. It's this invulnerability that you saw when the enemy Lycus just jumped in the middle of you and proceeded to execute all of you, because you didn't all spread out when he was invulnerable do he just spammed the grab button while invulnerable which caused him to be invulnerable again and the rest is history.
8. Ammo: I see you level 1 spamming the out of ammo button. I can't give you any, there is no ammo packs either (I can just give you the thumbs up "ok" like everyone else in the group is doing). In order to get ammo you have to execute an enemy with melee combat. Think of it as mugging them and stealing what's in their pockets right when you execute them. You don't get more ammo on respawn. You have to punch people to get ammo. It will let you know you got ammo when you finish an enemy.
That's all I got for now. any of you veterans want to add to this? Please feel free.
EDIT: Let me add this vid as well from Hihasuke:
https://www.youtube.com/watch?v=ooHzJfLvvC8