Sisu 2, or SI2U, 8/10
You'll never guess which movie this is a sequel to.
This takes place two years after the first one, after the end of the war. The Soviet Union has assimilated a part of Finland, and hundreds of thousands of people have been forced to relocate to other parts of Finland. The protagonist heads the other way: into the Soviet Union, to reclaim his home by taking it apart log by log, and transporting it back across the new border. Then a wrench gets thrown into the gears when the Soviet commander responsible for the deaths of his family starts hunting him. This might sound like a more extensive setup than the first, but it's over in like the first 10 minutes, and the following 80 are precisely what the first one offered, but bigger.
This is in many ways a perfect sequel: taking what worked about the first and blowing it up, but without messing with the formula. If anything, this is in some ways even more stripped down than the first: in the first you had the carriage of women the nazis had captured, in this movie there's not a single female character present. In the first movie the protagonist said basically nothing, here he says literally nothing. If I were to guess the amount of dialogue overall is even smaller in this than the first. This is pretty much a movie about the finnish Doomslayer. I'm eagerly waiting for edits of the movie which replace the soundtrack with "BFG Division".
Where the dialogue and story have been leaned down to bare bones, the action has been bulked up, and boy has it ever. In the first movie you had two cars, one tank, and one airplane. Here you've got cars, motorbikes, multiple airplanes, tanks, and a train. The kill count is probably like 6 times that of the first. The gore and violence have been amped up majorly, finding all new creative ways to mutilate the human body. The action is even more over the top, laughing in the face of the laws of physics in gloriously entertaining ways all the way through. The first movie had occasional inserts of pitch black gallows humor, this veers into straight up Tom & Jerry territory multiple occasions and it's hilarious. Stephen Lang is a fantastic casting choice as the villain, because he has that exact same stern, gruff, stone-faced charisma Jorma Tommila has, making him the perfect foil. The finale is a glorious, balls to the wall action spectacle that deserves to stand among the best of the genre.
I don't know if I've seen an action film this singularly pure since The Raid. Even John Wick has much more worldbuilding, dialogue and characterization than this. Genuinely among the best action sequels I've ever seen.