Martin Johnson gave credit to Georgia after England's opening win of the World Cup.
England scored 12 tries in a one-sided 84-6 win, but the Georgians never gave up and were full of running throughout.
In the first-half England found it particularly difficult to build any momentum in the face of some firm Georgian tackling.
"They were tough and physical and we didn't have it all our own way," Johnson said.
However, the manner in which the Georgians took the game to England pleased the skipper.
"They played differently to as we expected and defended pretty well," he added.
"We needed the run out and we didn't concede a try which was one of the targets.
"We were a little bit rusty but no team will play their best game at the start of the tournament."
All eyes will now be on England's next match against South Africa, a clash that will determine who qualifies for the quarter-finals as pool winners.
Clive Woodward's side face the possibility of losing scrum-half Matt Dawson for the match - after the Saints veteran suffered a blow to his left knee.
The Springboks looked ring rusty in their first outing against Uruguay despite enjoying a similarly comprehensive victory.
"Us and South Africa probably didn't learn too much watching each other this weekend," Johnson continued.
"There are things to work on and it's all to play for against South Africa."
Georgia coach Claude Saurel said his team would learn from the exposure to better players.
"Of course we are disappointed," the Frenchman said.
"We expected to do better, but considering the quality of our opponents we did well.
"What was useful was that it was good to play against good players."