It's true what you say about the Frieza Saga in general. I haven't seen the original unedited saga since I was a kid, but Kai makes things a lot better imo. The Namek/Frieza sagas certainly still have some slow moments though. Like you, I still enjoy the Cell Saga most even if I think he was a less interesting character. There's some really great action in the Cell saga, and it feels like we're not staring at the same green water and trees all day like we did during Frieza's Saga. Oh, and the planet isn't blowing up for 1/3 of each episode.