Hollinger thinks he is the best kept secret in the NBA:
https://insider.espn.go.com/nba/story/_/page/2011-12-uth-preview/utah-jazz-player-profiles
The best-kept secret in the NBA right now is Fesenko's monstrous defensive stats. It's not that one or two metrics point out his defensive value; it's that all of them do, without any pointing to the contrary.
Last season the Jazz were an eye-popping 11.91 points per 100 possessions better on defense with Fesenko on the floor, and this is not a new trend. The season before it was 8.67; in limited minutes his first two seasons he also had a strong differential.