For better, for worse: Changes of scenery can help, hurt veterans
In baseball, it's a question that has been asked as many times as there have been players, perhaps plays. Are a player's raw talents really the determining factor in making him a success or can environmental factors (park factors, lineup, etc.) offer further insight into what makes a player produce at the highest level?
In some cases, it should be clear that a player's surroundings can, in fact, play a significant role in making him better or worse, while in some cases, as a player's skill set begins to erode (through nature), things can and do take a turn for the worse.