Why do people say that Silva is so strong?

I don’t really get the hype around Silva. From what we’ve actually seen in the series, he hasn’t done much to justify the way the fandom talks about him.

The only notable thing he did was teaming up with his father to fight Chrollo, where after a long struggle to barely scratched him, he tried to use his fucking dad as a sacrifice just so he can kill Chrollo and still failed. He really reminds me of Vegeta in the cell saga.

I get that he’s the head of the Zoldyck family, but fans put him on the same level as people like Hisoka, which he really doesn't seem to be even close to.

Am I missing something here, or is his reputation just based on speculation rather than what we actually see in the story?