I think most people expected Until Dawn to sell poorly, until it didn't. Same with Shadow of Mordor. Despite critics apparently not mattering according to some people, if a game like this or Until Dawn gets a media/critic reaction of "Hey, this game is much better than I thought it would be - 7.8" then that sort of buzz will drive sales. Conversely if a game gets "meh, this game is OK but not as good as I hoped - 7.5" then this will depress sales. Even though the actual critic scores for such games might be very similar.

TLG's problem is, if we go by how critics usually react and score things, if it gets low 8's it will probably mean most critics are on the "eh, it's good, but not the greatness I expected" side and this will have a reducing effect on sales. So really the critic benchmark is >8.5 for critics to really sing the praises of the game.

Will be really interesting to see if the game creates post release buzz.

Problem is, although you're right that both of those games were helped by surprisingly good reviews, they are also far easier sells. SoM is a game in the LOTR universe, Until Dawn is a horror game.

Even if it reviews better than expected, Last Guardian is a puzzle-platformer with a weird animal thing.

As CGI pointed out, Heavy Rain was a niche "interactive movie" that had virtually no elements that would appeal to a mainstream audience, and yet it sold much better than people thought. TLG comes from a respected developer who in the opinion of a reasonable number of people made one of the best video games of all time. I think that pedigree, along with a possible "better than expected" media buzz would help a lot with getting credible sales that exceed pre-release (realistic) expectations. And being an excellent (hopefully) not just another shooter may work in its favour.

The capture along with youtube compression is pretty crap, but gameplay looks good. At least from the 5 minutes I allowed myself to watch.

I predict first week sales on par with Gears of War 4.

Looks good. I hope this game delivers

So it would seem, and you're right I never played Ico and SotC, SoulCalibur on Dreamcast made me forget about getting a PS2 that gen lol. This (and those older two) could definitely be a game I would like, but I'm going to inform myself a bit more. Because I never played the other games, I don't really have the confidence yet many others seem to have.

Gameplay ( and graphics ) Looks really dated . This game should be release in PS2 era.

Yup, thought so :)

Just give it a chance gorst is all I can suggest. There isn't any amount of reviews or videos that you will watch that could make this become a game you want. That's kinda the thing. I can guarantee this much, the controls will seem vlumcky atimes, there will be minimal view or landholding through out the game, you probably won't understand what or why you are even doing what you are doing, it will have great music, the animations will be on another level, regardless of how dated or artsy the game looks you will catch yourself staring at your screen admiring something every now and then...... That is what the team brings into this game. 

I know I sound like an evangelist for the game, but that's really the best way I can think of to describe it. I'm sure this game will frustrate anyone that plays it. But you will love it for it. Anyone that's played their other tow games will probably tell you the same thing. The coolest thing; their other two game have absolutely nothing in common with eachother. Nothing outside all the stuff I just described above. The gameplay and plot of those two games couldn't possibly be any more different. But yet they felt very similar. Unmistakably team ico games. If that makes any sense. 

And thats why Sony press conferences are always the most popular. People have always high expectations of them. You don't really expect MS or Nintendo to just announce a slew of new AAA IPs, every gen.

The variety is good and has been consistent every gen in Sony's catalogue.