Kaku mostly tells stories with cosmology and futuristic buzzwords these days. If you want to excite the imagination of a child and foster interest in science, I find his stuff potentially useful. However, the actual educational content is pretty poor.

I used to love Kaku as a kid. I read his book Hyperspace several times in elementary school and even ended up buying a string theory graduate text out of the induced enthusiasm. That book was scary impenetrable to me at the time. Lol

Now Kaku's videos and stuff just leave a bad taste in my mouth. It fells like he mostly sells science as some magical mysterious thing that is only accessible to the intelligentsia elite.