It definitely has the highest success rate...even Kamehamehas have whiffed, and the ki volley HAS to be the one with the most failures, but calling it OP seems a bit over the top. I'll give it an S tier in support and utility, but it has yet to kill anyone that I'm aware of.
But since we are on the subject, what move did Vegeta use to destroy that planet of bugs....that shit is in the running for most OP and that was base Geets....where in tf did that go?