LOS ANGELES, Nov. 12 (UPI) -- Wendi McLendon-Covey, David Alan Grier and Allison Tollman said their characters' flaws on St. Denis Medical , premiering Tuesday at 8 p.m EST on NBC, are fun to portray. In the medical comedy, Tolman plays nurse Alex, Grier, doctor Ron and McLendon-Covey, administrator Joyce. Advertisement "Flawed, damaged, those are the best [characters]," Grier told UPI in an interview in Los Angeles. "Who wants to be [expletive] perfect?" St. Denis Medical is explicit about the