Chasen Shreve hasn't been a star, but he's easily one of the best rookie relievers in the game right now, and may just be the second most reliable reliever the Yankees have right now. He's got one quirk to his game, however.
He wasn't the marquee part of the Manny Banuelos trade. That was David Carpenter. In fact, it wouldn't be a reach to say that most fans outside of Atlanta had never heard of him before. There are probably quite a few who have no clue that Chasen Shreve exists, or that "Chasen" is actually a real name.