I loved this show as a kid, but there are some fatal flaws that make it hard to watch.
"Keyop" is the most idiotic character in the history of television. Instead of hiring a child actor, they shortened his lines with a series of verbal beeps and chirps and short lines. I have to mute the sound when he speaks it's so annoying (he's surpassed Fran Drescher as most annoying TV voice).
Many of the English episodes are also poorly written, even for a kids' show. It was like little effort was made to make things consistent, even within episodes.
The original Japanese footage has a lot of great art work in it, and even some great camera angles that make it visually very interesting, even advanced. And how can you not love robotic dragons, sea monsters and mummies? :)