Here's my favorite devs this gen.
Team Yakuza
Yakuza 3 and 4 are some of the best written games of this generation. Gameplay is well done, Yakuza 4 adding three characters all who play different, then the Dead Souls spinoff basically playing like Yakuza with guns. The amount of content each of these games has ranges from all the different quests you can do plus all the mini games that are added in as well. Boxcelios 1 and 2, Bowling, Table Tennis, Shogi, Karaoke, Pachinko, and Golf are about half the mini games included in Yakuza 4 and all of them are very high quality for nothing more than additional side content. There are all the Ryu Ga Gotoku games we didn't get in the west like Kenzan and the Black Panther games, plus Binary Domain is a decent third person shooter.
Naughty Dog
Uncharted is an amazing third person shooter series with a great traversal system which breaks up the monotony of just constant shooting. Each game in some way impproves on the last, while debatably Uncharted 2 is better than the third, the melee segments of the third game add a lot to the game that the second just doesn't have.
My opinion of best developer is based on the Uncharted games as I've still yet to purchase or play The Last of Us, so can't really judge the game on personal experience, but from the official videos I've seen and from reviews, it takes the Uncharted style and pushes it as a stealth/survival style gameplay with far better gameplay than any in the same genre.
FromSoftware
The Armored Core 4 games, Demon's Souls, and Dark Souls were all great games. In my opinion, unless you're going to play a lot of multiplayer online Armored Core 5 and Verdict Day are disappointments and the worst in the series.
