Instruct: Classify a review as either positive or negative.
Query: Where Dragon Ball Z starts to get really good

I'll be the first to admit that the first half of DBZ, Boxes 1-4.5, run pretty slow and sometimes get boring, especially the Freiza saga! But this is where DBZ starts to gets really good. This is where the animation gets really good and where the story starts to really pick up with less filler. I always thought the Gohan vs. Cell and the Goku vs. Majin Vegeta fights were the some of high points of the whole Dragon Ball series.