1992's "3 Ninjas" was a really cool movie, back in 2nd grade! I felt that it would of been best to leave it alone. But, like all money hungry executives do, they have to go and make 3 lame sequels that overexpose what made the first one successful: fighting. And I don't know what the hell the filmakers were doing while shooting these movies and casting the stars? I guess they filmed the third one right after the first and intended for that to be the second one, since the kids in it are the same as the kids in the first! (still with me?)
But overall, this is the worst of the four. Was it supposed to be a prequel or something, 'cause all three kids look about 5 years younger than in the previous movies. And even if it was a prequel, the filmakers obviously didn't realize the kids don't get their names until later. Please don't rent this movie to enjoy it with your kids or yourself. Rent it to make fun of it with a friend or sibling, but beware, it might bore you or cheese you to death before you finish it!!
Note: A black belt doesn't screech out a high-pitched "HI-YA" when doing something like throwing an egg at a bad guy or cutting a rope that releases an anvil or something of that sort that black-belts don't do.