I was honestly quite disappointed in the movie. I enjoyed the various tactics involved in the ship/ship combat of the original series - the movie has 100% no ship/ship combat and all the action unfolds with little tension. 1/2 the movie involves various competitions among the school's classes - these can be give or take fun to watch, but it felt like a long time before the insubstantial plot of the movie starts to actually begin. The bad guys (pirates this time around) pop up then disappear again without doing anything memorable.
We get to see a bunch of different ships and their kawaii crews - but their screen time is forgettable aside from random ninja Mafuyu which seemed out of place. Mashiro has some conundrum that resolves predictably, but aside from that we don't get much in the way of memorable moments from the original crew. We also need much much more of Wilhelmina.
Overall the movie can be summed up as forgettable in every way. If the movie was never made nothing would have been lost.