I'm happy to say this is another (minor) step up from the previous film. While the art style is surprisingly dodgy, they've taken the DBZ franchise to a much weirder place, almost to the point of self-parody. This franchise is at its best when it's not taking itself too seriously, and this film is random as fuck.
There are several plotlines here, one involving a battle against Hitler and his troops, but the main line follows Goku's fight against Janemba, a weird childish blob containing a whole bunch of evil. Janemba grows stronger when he fuses with Freeza. Goku and Vegeta see no other option than to fuse too, in order to stop this formidable monster.
The animation is fine, but the art style is a bit distorted and angled, not pretty at all. I liked the almost super-deformed rendition of the Hitler battle though. Janemba is also pretty funky, and the plot is completely bonkers. If they keep this up, it might eventually reach the heights of the original Dragon Ball.