Of course it should be criticized just like any other movie should, since it did revolve a little bit too much on the romance element and of course some natural faults into it, but that does not mean I am going to read the plot online then tell everyone in a public forum that "This filler movie is terrible, because of the plot that I read online despite not seeing the visuals and directive of it!".
This mistake is currently being repeated with the Boruto Movie, despite being the top seller in Japan and with plenty of praise for the interaction between Bolt and Naruto, people who haven't seen it are already jumping in the bandwagon after knowing the plot and criticizing it without actually seeing the movie to give it a proper input and legitimate criticism.