If you've been as disappointed with "Studio 60 on the Sunset Strip" as we have, then you might be approaching the similarly-themed sitcom "30 Rock," which premieres tonight at 8 p.m. on NBC, with a bit of trepidation. If a so-called "master" like Aaron Sorkin can't write a compelling show about the backstage antics of a late night comedy program, how could a mere "SNL" alum like Tina Fey do any better? Well, we're......