I was thinking of the usual Sentai shows when I hear the title of the anime Zetman and the first thing that comes to my mind is the image of the hero in human form that performs a pose and shouts his name "ZETTTTTOMANNNNN!".
But that's not what the show is when I've watched the first two episodes and is very far from my perception of the classic sentai scenery. In fact I have a big gut feel that Zetman will be my favorite among the batch of animes that I'm following this spring in Japan. Probably because I like shonen and action that I favored it among the usual Otaku picks.
The big leap that you'll notice is the artwork! It's different from the animes you'll see today and looks more like a combination of eastern and western style of strokes and finishing. You'll see in the style of the clothes to the uniquely done hairdos that the anime is a hybrid - one thing that you'll notice that never changed is the animation which remains the same when compared to other animes.
Story wise it's simple and you don't need to tire your brain thinking of the deep twists, yet you can feel that there's something surprising in the end that will touch the emotions of the viewers. It's still too early to judge the anime but I like the way on how it performs right now.
All the elements that you're looking to a shonen anime is there! I'm excited to see on what will happen to Jin and Kouga's relationship It's nice to see something refreshing these days since Ninjas, Deathgods, Samurais are now overused, I hope Zetman won't dissapoint as the series progress.