I feel like the third person linear action genre is sort of in a crysis, open world is threatening enough to absorb everything and the reviews aren't helpful with the few games that do come out.
U4 has a huge weight on its shoulders now, to prove that this genre is still relevant, that people are still interested in linear action games, that it can still be as important and big as open world games, selling a lot and being a leading GOTY contender.
I feel like it's really important for the genre if U4 will get a 9+ MC just to make a point.
ND was really smart about evolving Uncharted into next gen it seems, if it was just "another Uncharted" with amazing visuals but the same exact formula of the PS3 games, reviews would have slayed the shit out of it.
Luckily it seems like ND did make some very promising changes, we'll have to see how it worked out.
If U4 will recieve a not so warm welcome, I'll feel it can be a final nail or a very significant one at least, in the genre's coffin.