One thing that makes me sad about the new Wolfenstein is that it will inevitably get glossed over, while overhyped drivel like Titanfall gets more media coverage than two wars and a kitten massacre.
It's a solid, competent FPS with good level design and good supporting mechanics. You can stealth your way through many sections, exchange fire from cover (with one of the most unobtrusive cover systems ever) or just dual wield shotguns and plow your way through the Nazi hordes while laughing maniacally. There's even a perk system that rewards unlocks not for arbitrary XP points, but rather by completing gameplay objectives that encourage you to try all the various approaches to murdering Nazis that the game offers. Again, it's unobtrusive and feels like a nice extra.
But where the game shines is the worldbuilding and characterization. The plot itself is fairly unremarkable (though not bad), but the alternate history that's built for it is just great. And again, it's unobtrusive - you get it through journal entries, recovered letters, newspaper clippings and overheard conversations, and it all paints a picture of how the world turned out, both on a personal and global scale. From the events in China and Russia to day-to-day lives under a world-spanning Nazi regime, it's all there for you to find.
Hell, the developers made alternate German versions of songs from the period! [https://www.youtube.com/watch?v=x_artPecEaM] That's just going the extra mile there!
Characters themselves are believable, fleshed out and feel like actual people. Even B.J., despite seeming like a generic square-jawed meathead FPS protagonist is actually a subversion of that trope - while outwardly he does often act like the "action hero", his inner monologues and his interaction with people in quiet moments reveal a thoughtful, introspective individual with plenty of remorse and regret who just wants to set things right.
It's a wonderful game, the best Wolfenstein game and one of the best single-player FPS games in a long while.