So the OP disagreed with the poll and made a thread about it? Why? I disagree with those polls 90% of the time, sometimes they show insane results but I just shrug it off...
The biggest letdowns of this generation, for me, all mostly all from Western developers so my subjective opinion is that the OP is wrong, or at least not right.
This hasn't been a mindblowing gen at all in my view but Japan would still come out on top for me as well and I did vote for it.

PS: "Makes the best games" doesn't rule out that it implies through all time. I have a friend whom you could say makes the highest sounds when he farts. He always has.
Makes can imply something ongoing and doesn't strictly have to be only the present.
Ford makes cars, for instance, does not mean that they recently started, does it?
In fact, we know they didn't.

Now list how many non-japanese games beat them which is what I told you in the beginning.

Mario
Mario Kart
Super Smash Bros.
Legend of Zelda
Pokemon
Gran Turismo
Metal Gear Solid
Final Fantasy
Dragon Quest
Resident Evil
Street Fighter

Some of the best franchises of all time that are still incredibly popular this generation. Japan does nothing of significance? Surely you jest.

Beat them how? Sales, because that has nothing to do with quality. Metacritic? Because thats a meaningless score, the mostly casual reviewer base is going to give an easy game like Call of duty a higher score then an in depth time sink like monster Hunter. Really the quality of titles is subjective, if you think the west has made better games, thats cool, and I agree that they have made some of the best games of all time. But the japanese have an equal amount of classics that people really enjoy, so don't belittle them just because you don't like them.

Well, since my Japanese list is based on personal opinion, I shall give the same personal opinion for Western Games:

Mass Effect
Dragon Age
Bioshock
Dead Space
Forza 3
Uncharted 2
Little Big Planet
Gears of War 2
Halo 3
Torchlight
Titan Quest
Resistance 2

And that's pretty much it

Aside from Capcom and some games from other devs here and there, Japanese games are rather poor this gen compared to the previous gens and to the American games of this gen.

List of great non-Japanese made games that do not depend on guns this gen:

InFamous

Alan Wake

Dragon Age

Batman Arkham Asylum

Assassins Creed 2

Heavenly Sword

Guitar Hero franchise

Rock Band franchise

Forza 3

Project Gotham

Little Big Planet

Prince of Persia

Marvel Ultimate Alliance 1 & 2

Brutal Legend

Oblivion

Prototype

Burnout Paradise

Pure

Dirt 2

Need for Speed: Shift

 American (canada included)/ European devs have been owning this gen.

Can't we all agree that both Western and Japanese developers have been giving us great games this gen? This kind of West vs Japan competition is getting rather ridiculous.

It was not present-tense, but rather which country has made the best games over the history of their various game developments. This is why I included older series on my lists. You could make an argument that Japanese developers haven't been in form this generation compared to Western developers, but they also have a long history of fantastic classic games. As the Poll Administrator, I'll stay neutral on this issue, but I think you've misinterpreted the poll completely.