In the East the least deserving was Al Jefferson. Al is the third best big man in the conference. He made the team over the best big in the conference, who wasn't an All-Star at all. That man is Anthony Davis. He should have made it over Jefferson.
In the West the least deserving was J.R. Smith. The Portland legend is still a good player, but similar to in the Eastern Conference, Smith made the All-Star team over one of the best shooting guard in the conference, James Harden. The volume likely is what caused him to be snubbed but the efficiency is incredible. Note I think he's the third best shooting guard in the conference, but Bojan and Lou were hurt.