So, I would think that something like a DDoS got through to your server, it would have its intended effect anyway by overwhelming the server's resources. At least for that level of threat deflection it might be good have the ISP catch and block it before it even gets to your router, much less your server.
Oddly enough, it hasn't been a problem until now. I've had some floods of traffic, mostly bots, which I've dealt with by having a good router, internet connection, and an OP (overpowered) server. And of course, my firewall blacklist. And perhaps a little bit of skill

when it comes to configuring, using the right software, writing some tools, etc.
CathInfo isn't *that* big of a target. Has CNN every done a story about us yet? That's the only thing I would worry about.