Your concerns are totally valid as per the demo they showed, but in your previous post , you have already predicted the ending, the way whole game will be played out. Others has shown valid concern about there reaction towards these new changes, but you are expecting the game to be played out same as the demo. fighting 2-4 enemies in a demo doesn't imply that you will not get to beat 5 enemies or more.
Also i didn't get your comment on QTE , did you liked the previous games qte or not? if you do than what's the problem with this demo, you get to finish the strong enemy with a finisher which is also rewarding , by the looks of it.
You can expect different weapons and how to possibly use them in different ways, i just read that axe can be thrown like a thor hammer , and it will be back to you whenever you want.
Combat wise I think that the biggest limit is the camera, in order for Kratos to be able to execute the crazy combos like he did in previews games. From what I understand the battle will be slower, with fewer enemies on screen and with a more cinematic approach. Obviously I havent made a verdict on the combat system from just seeing one weapon and some action, but this is what I think will happen by looking in the combat systems from other 3rd person action games (Tomb Raider for example).
Will Kratos have the entire old arsenal (like Rage of Sparta) in his disposal in the new game? If yes, try to imagine how it will work in the game world with the camera in the way it is. If not, the best combat system at the moment is the system the Souls games use, so they could get some ideas from there. But because they aim for mass market and cinematic gameplay I think this will be very unlikely to happen.
I believe that they will stay into two-three combo hits with whatever weapon Kratos has, followed by a button prompt for a finishing animation. The most complex thing that they will implement is the use of the Son Button and maybe between combos your son makes a few hits or you make combos together with your son.
We shall see, I agree with you that it is still very early to make any judgments.
QTE finishers are ok by me when the designers dont overuse the mechanic, when it works only in special enemies (so it works as a reward for the player, after the enemy is down) and when it doesnt break the flow of the battle. I believe that green and red orbs will be there in the final version, they just didnt showed us this yet to keep the reveal of the game to be more epic/cinematic, exactly like they hided the button prompts for QTEs.
Now in the story part, the whole story arc will be based in the relationship between Kratos and his son and how the events of the game affect this relationship. I think that the following sums up the entire story:
"This game is about Kratos teaching his son how to be a god, and his son teaching Kratos how to be human again.
So this brings four possible outcomes for the story of the game:
Kratos dies/gets kidnapped and son takes revenge/saves him.
Son dies/gets kidnapped and Kratos takes revenge/saves him.
They both survive the events of the game and the live a happy family life.
They both die and you get end credits.
You can add a mother character somewhere there to drive story events, but you get my point, something will happen that will make the slaughtering to begin, but how it will end is easily to predict.
I think if they try to kill Kratos again feels stupid story wise, they tried (multiple) times to kill him before and the guy even killed the god of the Underworld, Hades, and came back from the dead.
I would be extremely surprised if they pulled another Aries from GoW 1 and make Kratos kill his son again in the end of the game. Imagine that after you spend hours interacting with him, level him up, teach him to hunt, survive battles, bond etc and then make you kill him in the end.
Especially if they do it by making you think that you fight the arch enemy/final boss of the game, but that arch enemy to be an illusion and in the end revealed to be your son. That would make gamers physically feel pain and strong emotions from the loss and set the stage for a sequel with a crazy for revenge player/Kratos.
But nothing this exciting will happen and we will get another happy end with the Kratos family by the fire making generic joks.