Jayson Stark has a good column on  ESPN:

http://sports.espn.go.com/mlb/columns/story?columnist=stark_jayson&id=3483646

He claims Silva is deserving of the worst AL pitcher of the first half, but notes that Hernandez and Bonser are right behind him.

Picking against a pitcher (Livan Hernandez) who's on pace to become the first man in almost 30 years to give up 304 hits in a season was as tough a call as our Cy Yuk panel has ever made. But at least Livan wins a game now and then. In fact, four of his nine wins are against teams in first place.

So let's bestow this honor on a pitcher who raked in the biggest free-agent pitcher contract of the winter ($48 million for four years), who hasn't beaten an American League team since April 17 (0-10 in 13 starts), who is supposed to be a ground-ball specialist, but has still allowed his opponents to slug .491 against him in a pitchers' park, who helped get his manager and GM fired, who even directed a thinly veiled public rip at Ichiro Suzuki. True, there are still 3½ long years left on Carlos Silva's contract. But he has sure positioned himself to rank as one of the massive free-agent busts of all time.

Sighs of relief for: Hernandez, Joe Blanton, Boof Bonser, Miguel Batista and that Phil Hughes/Ian Kennedy tag team.

I guess Silva is making that Hernandez signing look pretty good.