OVH have a simple problem, their antiddos have a lot of false positive (When it is enabled, you will feel issues like random lag or delay and many people will complain they can't connect), yes it can handle a few attacks but it is not really the 7th world wonder :D, and eventually you will need to disable it to avoid the problems, and when the attacks are back, you have another downtime, will need to enable it again and face the issues again, however it is the 'only' option people without budget will have, there are no others... (So, face the issues :P)