The monsters that are supposed to invade Earth are seen as total weaklings, the monster boss suddenly disappears, and then there's a 13-year timeskip. One monster boss is left, but he's nothing compared to the rangers.
Meanwhile, the rangers who are supposed to be heroes act like total jerks, especially the red one. Seriously, what the heck?
History and rules really are written by the winners, doesn't matter who wins.
Seeing that fat Dusters Z sacrifice himself because he's fed up with the 13-year charade was kind of touching, even though they don't even have faces.
"Sometimes humans can be worse than monsters and demons themselves.".