Depends, really.
As I was trying a few deck options in casual today, I had 2-3 matches with said NG deck manipulation archetype. Sure, as soon as I see NG I try to keep all the cards in my first mulligan that are risky for Warrit - but in the end, you cannot avoid getting swarmed with less-than-optimal cards and having one of your more valuable assets stolen.
However, and that was somewhat odd, out of those 3 matches I won 2 without relative easy and a good point lead, even though the opponent totally messed up my deck - and the one where I lost was 4-5 points difference too.
Definitely an annoying dectype, but they also suffer from a generic lack of points to win their games, as I see it.