"We got what we expected - the Waratahs talked about taking it to us physically and they tried to do that. I thought our guys responded to that physicality and, in the end, we were just too big and powerful," said Gatland.
"The No 9 and No 10 were being tackled off the ball and late. We were trying to communicate that through Sam to the referee for the assistant referees to be vigilant in looking after our half-backs.
"The big key in this game was keeping our discipline. It would have been easy enough for someone to be taken late, lose their head and throw a punch, it be picked up and then cited.
"I thought our discipline was absolutely fantastic. There were little shoulders and charges and guys being taken late and stuff.
"That's part of rugby, people try to unsettle you a little bit, and we've got to accept that. It's how you respond to that niggle, and I thought our boys were magnificent.
"They fronted up to us physically but the boys responded extremely well and that was a performance out of the top draw. The last few minutes we were down to 14 men and they kept plugging away, but we dominated that period really well - I'm really proud of that performance.
"Defensively we were strong. They were playing a three-prong system and we spoke about that at half-time and we were coming off our line pretty well after that.
"Our rucking delivered some good front-foot ball for our backs and the set-piece was excellent again. The scrum was strong, the lineout was good - we showed them a little bit tonight but not too much."