Radec said:
A game should surpass GTA:IV's 98% for this gen to become decent.
Would have been awful if the highest rated game this gen is "just" GTA:IV.
I doubt UC3 will surpass UC2 though (Score-wise).
Critics will probably deduct a point because "it has been done already" or "lack of originality" and still gives MW3 a 10 with a trollface.
UC2's 96 is probably statistically equal (that is, within the margin of error) of GTAIV's 98, so it's not really worthwhile to get hung up on a few points of difference in the top 10% of the scale.
I completely agree that even if sequels get better, they are contending with the players'/reviewers' habituation to big impressive moments. It will be hard for UC3 to make a strong subjective impression that is proportional to the "objective" improvements that have been made. In hindsight, some reviewers may even think they overrated UC2 as a result of the hype and make a conscious decision to try to avoid doing that again with UC3. There are just a lot of factors that have nothing to do with the game's "objective quality" that will be pushing scores slightly downward.
And lastly, from a purely statistical standpoint, it's highly improbable that it will score better than UC2. And again, even if it did, it probably wouldn't be statistically different from 96.
So when UC3 scores a bit lower than UC2 despite you (the general you) being absolutely sure it's the better game in every way, you needn't waste your time complaining about it.