Do you really think Meredith is going to put up the same numbers vs. the NL West as he would against the American League? The Red Sox called him up in 2005. He wasn't ready and he sucked. They had to get Mirabelli back because Bard was killing Wakefield starts. I saw his stuff; it really wasn't anything that special. Just a 2 seamer with a lot of movement, and that's about it.
I bet if Rudy Seanez goes to the NL West tomorrow, he pitches 15 scoreless innings. The fact is, there is a huge talent differential between leagues and production in one can't be compared with production in the other.