By the destruction of the Death Star alone, Luke has a higher kill count than Anakin did at 22, saved the Rebellion, and became a decorated war hero. And Luke did all that in less than a week of getting caught up in events.

Meanwhile Anakin had been building up to that point for years, and was only a General because all Jedi were Generals. Other than becoming a Jedi, it's not like he did anything specifically to earn that position.