Since there are no reviews by anyone who has completed the anime, I decided to write one.
This is an anime for children (PG). So don't expect a deep plot. But it does it's job well and I was hooked into the story when I watched it years ago when I was younger. I hadn't watched the last few episodes at the time and couldn't find them anywhere. Then about 2 years ago someone uploaded the last remaining episodes to youtube with captions and I was able to complete the series.
The story is about a fictional future where tournaments are held between robots for entertainment. The
protagonist wants to become the pokemon master - err I mean to get the Titan Belt by winning the tournaments. He has team of robots that he acquired from his scientist grandfather. Initially it looks like that is all to the plot. But later it turns out that an evil scientist is planning to steal the technology powering the best robot Daigunder. The story then gives more focus on fighting this dude.
What makes it good is that all robots are sentient and have their own personalities. They are able to change their shape and battle capabilities, like in transformers and they are able to fuse with each other to make stronger robots like in gurren lagann.
The animation is subpar even for a 2002 anime. I think they could have done better. But that is the only criticism I can find.
The story completely ends at 39th episode and does feel complete, unlike pokemon. So if you are looking for a PG show, this is a good bet. You can find all episodes in youtube.