And the intro itself is very well done in the art department. (Action/monsters/varied locals to draw said viewer in.) But the music?
I'm sure it's an earworm, since it rhymes and repeats the same words. Though it's a bit bland sounding...and the jack jack jack jack jack jack got a bit obnoxious the second time around. So I don't think that's a track I'd listen to outside of the cartoon. <.<' (Frankly, I'd skip it like a Netflix introduction.)
I mean if you just focus on the lyrics then I can guess it'd be bland sounding, but musically it's honestly what the people call a bop. It has a beat and rhythm that adds instrumentation with every bridge. But getting a well produced hip hop infused beat is what you get when you have will.i.am doing your theme music.
Like I can get if it's not your thing but considering most cartoon theme songs are meant to be like 30-40 second things that never change it's honestly impressive how much went in to such a brief thing.
I mean, the GOAT cartoon theme songs, that being Jem and the Holograms and Josie and the Pussycats, can't be topped so it's a wonder cartoons still even try.