...because now there's focus on the story & characters. While the main trio of Eren, Mikasa & Armin remain quite bland characterisations we do get some bloom from Hange, the captain and the officer.
The story is more coherent and somewhat engaging, the setting is still pretty good. Some more dynamic ODM action and a fun 'mecha' fight which recalls all those Godzilla-vs flicks.
It's honestly worth your time if you're curious and didn't think the first movie was too terrible. There's a lot less comically-gruesome Titan-feasting, but this sequel didn't need it.
Clearly tho', the animated series is where the really good stuff is. That's a 9/10 series throughout....all killer, no filler.