That hasn't been my experience.
Some players never really get it.
Some players never get good at certain aspects of play (like roleplaying, or tactics). In the case of roleplaying --or more specifiaclly, acting and characterization--, a first-time player could outdo a 20-year veteran (who simply doesn't enjoy that facet of gaming).
With experienced players, it's a moot point. They 'know' the game, and now they play for different kinds of play experiences (my group falls into this category).
And really, since different players want/get different things from the game, in all its myriad incarnations, you're going to have a hard time defining what 'getting good at it' even means.