But demos aren't the full game. Wait for more gameplay before you make a conclusion.

You're getting annoying. DUH ONE TEENY PIECE OF GAMEPLAY TELLS ME THAT THE WHOLE GAME WILL BE ACTION ADVENTURE. And stop saying the fake and false crap its a dumb counter argument.

From some posts here it seems I need to re evaluate my concept of a gameplay demo, I always thought gameplay demos were supposed to show you how the game would play, to sell you on the core mechanics basically.

On the other hand, some people seem to get offended for not calling the new God of War a hack and slash, which imo, doesn't look like one, looks more like an action adventure game, but there is nothing wrong with that either.

Well... Nobody here knows how the final game will truly be like. The trailer does indicate that it will be a much deeper naratively driven game, and Barlog also stated that the gameplay will indeed be different from what we've been used to so far with the franchise:

"I knew I didn’t want to simply reboot the franchise, starting over with a retelling of the origin story. I wanted to reimagine the gameplay, give players a fresh perspective and a new tactile experience while delving deeper into the emotional journey of Kratos to explore the compelling drama that unfolds when an immortal demigod makes a decision to change."

A lot of people are trying to define what a hack/slash is, but it's simple. A hack and slash game is a game where the combat system and fighting are the central focus. The game doesn't make you take on random tasks during a level (completing a series of small objectives) such as stopping criminals from stealing loot, or disarming bombs (Platinums TMNT), it doesn't focus solving puzzles or exploration (The Legend Of Zelda), and it doesn't focus on intricate storytelling and slow building pacing to introduce worlds, lore, and characters (the new God Of War). It drops you in on heartpounding action and almost forcefully keeping you the through the duration of the game, and good hack/slash games provide a depth of combat system that makes fighting unequally enjoyable throughout. Simply no other game genre will have you WANTING to fight more than the hack and slash (yet again, a good hack and slash game). While most genres people will want to rush past fights to get to the cutscenes, a hack and slash will make you want the cutscenes to end so you can get back to fighting.

That makes the original DMC an action adventure game since it had puzzles, shooting and exploration as part of its central focus. 

To some extent you could include Onimusha in that category too. 

In fact even the original GOW trilogy had a strong focus on story and had small puzzle sections throughout the games. 

I think everyone will have their own interpretation of hack n slash.

The original Devil May Cry was the start of the Hack and Slash genre, so of course it will have similarities to other genres. You gotta think what was successful at that time for Capcom, the Resident Evil series, and initially I believe DMC was said to be a Resident Evil. (If I remember correctly). It doesn't disprove what I said. 

Still a lot more fighting than exploring, the central focus of the game was still combat.

*edit* Yep, Devil May Cry started development as Resident Evil 4

http://residentevil.wikia.com/wiki/Devil_May_Cry

And yet you're trying to make a bigger deal out of it and attach some agressive tone where there was none.

Alt removed ~ CGI

God of War is a puzzle platformer with elements of extreme action. Yes, you get hordes of enemies to dice up but the game is not hack and slash. Dead Rising is hack and slash. So is Hyrule Warriors and Dynasty Warriors.
Days Gone is a World War Z simulation lol.