I have a pretty good contact with the old-skool OVH community and their administrators. And I can say that they don't throttle any traffic at all! (I'm sure of that)
And their support may be pretty bad if you have a non-pro offer. That means that if you get a 200€/month box you'll have a pretty awesome, first-class support. But if you have a 20€/month box and your hard drive dies, you'll have to wait one day or two. That seems fair to me.
I have 300 servers from the Kimsufi to PRO and the support is pretty much the same.
As for the throttling, that doesn't happen (as far as I'm aware) however they do have poor peering connections to the US so it's pretty normal to get 5kb/s there which is much worse.
And their support may be pretty bad if you have a non-pro offer. That means that if you get a 200€/month box you'll have a pretty awesome, first-class support. But if you have a 20€/month box and your hard drive dies, you'll have to wait one day or two. That seems fair to me.