1) it has a decent chuck of filler
2) the English dub changes the opening and ending, along with other things
Let's start with issue #1: the filler
Due to how it was airing along side the manga, Toei eventually had to add filler. There are 2 types of filler. True filler and episode extender filler. True filler is what most people think when they think of filler. It is episodes that non-canon and don't appear in the source material which is usually the manga it's based on. Episode extender filler is hard to notice because they just extend the show's further than usual and do nothing else, so it's hard to see unless you've read the manga. Dbz has both types. There are about 38 episodes that are true filler which is about 13% of the episodes. While it looks like a good it's not nearly as bad as something something like Naruto Shippuden which has true filler as 41% of its episodes. If you don't like true filler you can look for what episodes are filler by searching it up, or you can just just Dbz Kai. If you don't like the episode extender filler then you're just better off watching Dbz Kai
Now we're on to issue #1: some issues with the dub changing things
As something who grew up I love the English dub, but now after rewatching the dub I can see some issue with what they changed in the name of appealing to overseas fans. First of the song change for both the opening and ending. The English is the dub that has a different opening and ending song from the original dub, the Japanese dub while the OP and END remain the same as the Japanese dub. I don't ever recall ever hearing an anime that had to change the OP and END's song for a different dub. While I do love the English dub version's songs, I'd prefer to have the same OP and END as the other dubs. Now we get to the other half the English dub the weird line changes. These aren't as noticeable since it only appears twice. First is the line about Frieza talking about Dragon Ball, he says wants to the caress the dragon. And when he stabs Krillin with his second form's horn. He jokes that Krillin is riding his horn like a cowboy. Neither of which Frieza ever. Both lines are very cringe-y to listen to and weird
With those issue aside, the show is still good and holds up well
