I do wish the game would look as technically sound as The Witcher 3. Which is the best looking open world game on consoles to me.

That being said, I don't think The Witcher 3 achieved the same kind of scale that Final Fantasy XV wants to achieve. Which is the entire world being a single world map streamed in real-time, not segmented like in The Witcher 3 or similar games. The final part of that last trailer they showed is what leads me to believe that's what they're going for. When the car transform into an airship. Unless it wasn't a hint that controllable airships are back, I think we'll be able to take off and control our airship like we could back in the glory days of the franchise.

In any case, there are quite a bit of jaggies and  frame rate/pacing issues and they are distracting. But they have plenty of time to work on the rough edges and optimize until release. I played quite a few Square-Enix games and bad performance is rather rare from them. 

To me, most of the ones complaining and trashing this are over-reacting. Interestingly enough, it's the same people who do this kind of thing for most things on VGC. So I'm not surprised to see you all bandwagoning here as well.

The game looks gorgeous to me

But yeah, I noticed the frame drops too :(

But it's not the main problem to me, the gameplay feels slow and boring

FFXV is not all one map like other open world games, Tabata said in an article it won't fully be open world or seamless, his description of how the game is makes it seem it's more closer to FFXII. It'll be segmented essentially.

http://www.novacrystallis.com/2016/01/final-fantasy-xv-wont-be-100-percent-pure-open-world-focuses-on-the-best-of-linear-and-open-games/

Bad frame drops, shimmering effect due to aliasing, low poly textures.... There's more than framerate that was disappointing.

I stand corrected. But driving an airship in this kind of setup is going to feel kinda clunky. Unless they've figured out a way to load the entire map when you take off in a given section, removing what's useless while you're in the air, only to load the proper section when you decide to land further along. 

I do want my free-foaming controllable airships back. =(

In any case, if the hunch I had doesn't apply, then Square-Enix won't have much reason for the game not running as smoothly as The Witcher 3. Except maybe that the game might have quite a lot more sub-systems going on at any given moment. That, and the global illumination method they're going for might be too much for current gen consoles.

Indeed. But except for the framerate, they're all things you should already be used to dealing with.  =P

Exactly, it seems to fail on all fronts. Even framerate. It's worse than what I'm used to dealing with. =P

You should try Episode Duscae. It's a much better way to introduce the game than this tech demo. It's much less juddery/it runs smoother, has actual gameplay in it, you fight more than one enemy at once with an entire party, have access to multiple abilities and group attacks, and there's actual exploration to do.

The battle system grows on you the more you play and get accustomed to it. I didn't like it at first. But then I got more experienced with it and found the Phantom Swords that unlock more abilities and I now think it's plenty enjoyable and I want to find what more is in store in the final game.

I did. It was good, still had some issues and didn't seem all that demanding (as the actual play area was small). That said it was undeniably better than the platinum demo, so who knows what the end product will be. 

Why is everyone still complaining about a free demo they clearly rushed to throw together to surprise people?