True Mazinger is a very good, thoroughly entertaining super robot show.
Pretty much, Kabuto Kouji pilots the original badass super robot, Mazinger Z. Dr. Hell and his psychotic minions are constantly waging war, they want to stop Mazinger Z and get all the various powers and technology from the good guys.
For the most part, the show is dialogue driven, with all the eccentric characters going into great detail about how they feel and why they want what they do. The plot is more explained than actually shown, although this isn't necessarily a bad thing, as it keeps the intrigue going.
The oldschool super robot action is a lot of fun, pretty much our hero in his Mazinger Z whips out a few signature moves and that's all he needs for the most part. The great rockin' soundtrack helps fuel these scenes with burning passion though.
The show is very quirky, it pays homage to a lot of random Go Nagai comics that for the most part haven't been translated into English before. Lots of random nods to Go Nagai's past works, which admittedly can seem a bit out of place.
Pretty much, this show is very strong throughout, although I have to admit towards the end, after many plot twists, some of the characters motivations really didn't seem to add up.
All in all, this is a very memorable show paying tribute to the father of the genre, and I recommend checking it out. Hopefully it gets the sequel series it deserves.