Agbonlahor typified Villa's attacking threat and deservedly won the match with his third goal in six games since returning from injury.
In an inexperienced Villa team the 26-year-old has been relied upon to provide the Premier League know-how and Lambert believes he is starting to deliver at the right time.
"Some of the performances he's turned in have been big, big performances," he said.
"His speed when Gabby gets a run on somebody there is not many that can catch him. It was good to see."