The 75 greatest players in NBA history, ranked by Player Efficiency Rating (PER)

70.    Chris Bosh, 20.56

Eight-time NBA All-Star and Hall of Famer Chris Bosh is one of the more polarizing players of the last 25 years. Although many acknowledge that he was a great player, some believe that he either put up big numbers on bad teams or was carried by better players on great teams. 

There is definitely truth on both sides. In Toronto, Bosh was a terrific offensive player, averaging over 22 points per game for five straight seasons. He could score in the post and had an almost automatic mid-range jumper that allowed him to pull opposing big men away from the basket. 

Once he joined the Miami Heat, he quickly settled into a co-starring role. He didn't always put a big number next to LeBron James and Dwyane Wade, but he dramatically improved as a defender and expanded his range out to the three-point line. Those two tweaks to his game made him a highly useful player and were key to the Heat winning back-to-back championships during the 2011–12 and 2012–13 seasons.

He boasts a terrific 57.1 true shooting percentage for his career, which is impressive, especially for a player known for shooting mid-range jumpers. After LeBron left Miami, it looked as though Bosh was ready to return to his Toronto level of production and had even become a high-volume 3-point shooter, which would have boosted his efficiency even further. 

However, he had two seasons that ended prematurely due to blood clots and was later forced to retire when he was still playing at a high level. Retiring near his peak was unfortunate, though it did ensure he'd rank highly in career PER.