Lambert praised his own two-goal striker Benteke, who took his Premier League tally into double figures.
"He's only 22, just turned 22. For someone who has just come into British football he's been exceptional," he said.
"I probably got criticised for signing him because he wasn't a name, no-one had heard of him, people thought 'What's Aston Villa doing signing him?' I'm pretty sure he's put that to bed.
"The frustrating thing is we didn't win having scored three goals but if we play like that we will win more games than not."