Barnes, Shved, Waiters and Zeller have all sucked this year. The first three are in by default, since this draft has had few immediate contributors and nobody has outplayed them at their positions.
Zeller has no such excuse. He's an inefficient scorer, a poor rebounder, a nonfactor on defense, and he's soft. Sullinger should have had that spot. I even think Henson has arguably played better than Zeller.
Overall, though, this has been a pretty unremarkable rookie class.