Player Efficiency Rating. It's a way to gauge players with no regard to the number of minutes they played b/c it's per minute. So Epipen's argument is that McHale came off the bench and is why his numbers aren't as good as others. Well, I look at PER and Malone's PER is much higher. It also adjusts for pace.
http://en.wikipedia.org/wiki/Player_efficiency_rating
PER strives to measure a player's per-minute performance, while adjusting for pace. A league-average PER is always 15.00, which permits comparisons of player performance across seasons.
PER takes into account positive accomplishments, such as field goals, free throws, 3-pointers, assists, rebounds, blocks and steals, and negative ones, such as missed shots, turnovers and personal fouls. The formula adds positive stats and subtracts negative ones through a statistical point value system. The rating for each player is then adjusted to a per-minute basis so that, for example, substitutes can be compared with starters in playing time debates. It is also adjusted for the team's pace. In the end, one number sums up the players' statistical accomplishments for that season.