DBZ Movie 5: Revenge of Cooler is about Cooler, Frieza's brother, who's come to the earth to have his revenge against Goku for killing his brother, but more importantly, to restore his family pride. This movie is non-canon, meaning it's anime original, and Cooler doesn't appear in DB manga.
Let's get into the review.
My Positives:
1, DBZ art style and music coat.
2, Good fighting sequences
3, Goku's and Cooler fight is good
My Negatives:
1, Being a brother of the arguably best villain in the DB universe gives quite the anticipation. Cooler doesn't live up to it. He's a more composed and calculated version of Frieza, but in every other aspect, he falls below his brother. 48-minute movie cannot possibly create a villain that would rival Frieza. He's there only to give Goku a good fight and to give us some Frieza vibes.
2, Gohan: His purpose in Revenge of Cooler is to act stupid, so Goku gets wounded to prolong this movie length.
In my opinion, Revenge of Cooler has really good fighting scenes (mainly, because the majority of them were used in DBZ), but its story and characters entertainment are mediocre.
I give it 6/10. I don't dislike this Revenge of Cooler, I think it's a mediocre movie. I can recommend you to try this movie at least once, but I cannot tell that you'll like Revenge of Cooler.