No getting away from the fact that those are very disappointing reviews, evidenced by most of the predictions, especially from Xbox fans. MS really needed a big score with this one since Scalebound was delayed and Fable Legends cancelled.

Probably get it when it is half price.

I expected much more from this game (especially when people compared it to Uncharted).

Just for curiosity, has there been a console that in its entire lifetime never got an exclusive with a 90+ score?

Im trying to think of one but i cant recall.

Some if the reviews are pretty brutal - http://www.ibtimes.co.uk/quantum-break-review-remedys-latest-glossy-charmless-not-ambitious-it-seems-1552501

What may seem like an ambitious project is in the fact the combination of a standard third-person shooter and the kind of cheap sci-fi drama you might find in the darkest corners of Sky TV. Visually tepid and filled with abortive gunfights and platforming, Quantum Break also struggles to contain its plot, while at the same time underselling its characters. Remedy's previous games have been characterised by a distinctive tone and knowing humour. By comparison Quantum Break is a glossy, charmless, wholly moderate outing.

PSP would be one if wasnt because GoW chains of olympus was released first on it, but it was on console later. 

Nope.

God of War Chains of Olympus - 91

That's what I have said. But it was released on console later and other than that there is no other 90 exclusive game. 

Scalebound and ReCore can still get that score. This gen is harder though.

While the PSP was alive the game was still exclusive.

If Bloodborne gets remastered on the Playstation 8, does it lose the exclusivity factor?

I guess not but the game was released on console before the release of PSVita, the PSP was still alive. Its like a Hyrule Warriors kind of "exclusive".

PSP is not on the bag of consoles without exclusives on the 90s but is a borderline qualifier.

To be fair, there's only couple of reviews like this one and majority seems to suggest the opposite. I'm only worried about the ending since many reviewers were disappointed by it.