Sure, the voice work is pretty bland and the dialog does get repetitive in each episode, but those flaws are perfectly outmatched by it's epic adventure storyline throughout the show and it has heart to it as well. Even the history of the Egyptian culture is shown perfectly here. The characters are OK, but I think that my favorite characters who came close to steal the show is Yami Yugi, Pegasus, and Bakura. What stands out the most is the nice music and it's lush animation. I also liked the monsters as they looked real just like it's textures. Even the Egyptian textures of the monsters like Dark Magician, Blue Eyes White Dragon, and Exodia, The Forbidden One are perfectly detailed.
Overall, Yugioh isn't a masterpiece of television and anime, but for kids, they have no choice but to enjoy this for all eternity while the movie adaptation, although not nearly as good as this show, was at least watchable.