Kaiten sucked, no great loss, but they should've had something with actual gameplay meat to replace it with before they cut it. So basically, Caprica is right.
Edit: There's no decision making to kaiten and the gauge management is laughable. It was literally don't Shinten unless >30 kenki. That's it. And that's still the case! Nothing changed! You still want to wait until >30 in case you need 10 kenki for a movement skill.