I've used OVH for years, from dedicated servers, to their very cheap VPS. Can't recall any service outages, and on the dedicated servers, any DDoS attack was successfully handled, whilst on other providers I would have trouble with DDoS. Is your statement based off one server of theirs? Make sure the specs you're renting are sufficient for what you are planning to do, don't just go for the cheapest VPS, especially if running a node.