For me, it's all about the best player available (BPA) that fills a need for your team. The only exception is QB because the NFL is a QB driven league and you need one to win it all. There are a few exceptions like when you have a dominating defense like Denver did.
Ability to finish with either hand around the hoop
Soft touch inside
Utilizes hook shot
Gives good effort on the glass
Uses his length to his advantage
High basketball IQ
Not very physical inside
Must become stronger
Shies away from contact
Consistency with jump shot
Lateral quickness as a defender
Summary: Zeller has been a solid and consistent big man during his career at North Carolina. He runs the floor as well as any true center in college basketball which shows his athleticism and effort for the a seven-footer. However, his lack of strength and physicality is a concern as he transitions to the next level. With his skill level though, he can be a solid back-up center in the NBA and should garner mid-late first-round looks.
Player Comparison: Dan Gadzuric. Gadzuric had a decent run in the NBA as a backup center, but his lack of physicality and ability to bang down low resulted in him being out of the league. Zeller is more offensively skilled than Gadzuric, but the two are similar due to their relatively solid athleticism and lack of strength. Zeller should have a longer and more productive career than Gadzuric, but has some of the same physical limitations.