Have you been DDoSed while on OVH? I've heard there are a bunch of providers who claim DDoS prevention, but what that means in practice is just "we'll take your site offline right away and not charge you for the incoming bandwidth!". Super helpful.
I've had several attacks hit my services on OVH. Not once did they null route, and as far as I could tell the majority of attack traffic was filtered with only a minor service interruption before mitigation kicked in. Granted these were shitty $10 booter services hitting me and not a "real" DDoS.
Be careful using services like game servers or VOIP or anything else using UDP though, since UDP is subject to much more stringent filtering at OVH and may get affected during mitigation.
I've also been DDoSed while on OVH. It happened twice and was a non-event. I would never have noticed if they hadn't told me. Now the asshats don't seem to even bother DDoSing us any more.
On iWeb, however, they null-routed us for half a day.