Once an avid fan of Saturday Night Live, Tom Simms, 16, said Monday that the live sketch-comedy institution began a downhill slide after Chris Kattan exited the show in 2003. 'They don't do funny stuff like Mango or the Roxbury guys anymore,' said Simms, who, from 1998 to 2004, watched SNL whenever he had a babysitter or could sneak downstairs after his parents fell asleep. 'After Kattan left, the show stopped taking chances.' Simms' older brother Joel and his uncle Kurt agreed that SNL's quality has declined, but linked the show's suck-points to the departure of Jim Breuer and Joe Piscopo, respectively. 