David Thorpe of ESPN named Andre Drummond his most surprising rookie who came out of college:
Cut to Detroit, though, and we see him playing with energy and athleticism on almost every play. That part of the game is easier for him now in part because the floor is spaced so much better in the NBA. The game is wider now, and his teammates are pros, not teenagers. So even though the Pistons are a bad team, they still understand the importance of spacing and playing under control.
The games are also officiated tighter in the NBA, meaning Drummond can’t be pushed around the same way he was in college. It’s a hard concept for fans to digest, but the college game is more physical than the pro game because it is allowed to be. The men in the NBA are stronger, naturally, but the game is cleaner, which allows a player like Drummond, who has not developed "man strength" yet, to make plays inside the paint and above the rim more easily now than before.
Thorpe placed Drummond fourth in his rookie rankings and put Kyle Singler seventh. No other team has two rookies in the top 14.