I don't know the full extent of how much it has effected the various teams, likely no one outside the orgs does. But I do know that in the interview it was stated that the DDoS attacks have also effected their Val team.
Being the class act that Faker is, he also said that these DDoS attacks do not excuse their poor performance. They know what they're going through, give them some time to work things out. They generally haven't looked lost or anything in their Val matches (the DRX game being a slight exception, though I didn't get a chance to watch those games so maybe it was closer than the scorecard indicates).