Compared to the original Yu gi oh, GX is a joke but this anime is still good. To become actually interesting it takes 110 episodes, yes 110 I didn't mistype. Before that there isn't even a story (the knights can't be considered as enemies) , just adventures and jaden using the same duel strategy at the academy. There are some very good episodes still, like jaden vs crawler, jaden vs zayne, and jaden vs the original yugi deck, and the last episode and there's many references to monsters of the original series, even Ra.
The second part is where this can even be considered worth reviewing. Yubel is definitely more interesting and it's a shame that the sacred beasts are used so rarely compared to the Egyptian gods.
The third part is very boring. It's about the future of every character and honestly it's even worse than the first part but the final duel of GX is between yugi and jaden, honestly it's one of the best episodes.
The first part is 4/10. The second part 7/10. The third part 2/10.