> they have colored costumes which are faceless?
Sorry this is maybe idiomatic, the idea of “faceless” as being without any visible personality...
Ebert was making the point that real teenagers have varied interests and personal preferences and individual stories that make them interesting characters who have interesting conflicts with each other. The problem was, the movie’s Power Rangers did not have this: they all had the same hobbies and the same interests and they did not have interesting conversations or conflicts with each other. In fact the only interesting thing he saw about them was that they happened to be power rangers. This made their journey to become Power Rangers anticlimactic for him: they all had very similar attitudes and preferences and tastes, so the only thing that was distinguishable about them was that they had different faces—but then the movie goes on to erase even their faces, so that they all are symbolically now the exact same person.
I actually think this would be interesting for Ebert if the movie “doubled down” on it, made it the intentional point of the film. So if the film was trying to make a bold point to teenagers that the constant striving to define yourself as an individual (dress a special way, act unique even for your friends group) was getting in the way of really finding unity with a group that could together accomplish what no individual does, that you actually need to find a group with a higher purpose and conform to that mission, rather than be some unique special snowflake. Kind of a play up those missing Confucianist values that nobody ever dares to talk up in America, that indeed we criticize other countries’ films as propaganda.
Of course if you wanted to make that movie, Ivan Ooze would have had to be a villain copy of, say, Rand’s John Galt—and instead of his ooze hypnotizing people into being his slaves, it would have to hop them up on paranoid narcissism so that they were only interested in pursuing their own glorious purpose, screw everyone else. Throw in a CGP Grey bit about how he becomes dictator not by holding the keys of power himself, but by being at the center of the people who actually hold the power, the one person they can all agree on as a symbolic figurehead frontman. Could have been very interesting if in giving up their individuality to become Power Rangers and serve a higher purpose, they became immune to the selfish nightmare the Ooze induced and were able to stand against it.
Just kidding, it's just a movie to introduce the ninjazords so we can buy shiny new toys