The cast on SNL may be ok, but the skits are generally garbage these days. I've watched SNL for most of it's history, and the writing is as bad as it's ever been.
It used to be that the first hour was good and you could count on the last 30 minutes to be so-so at best. Now, by the 3rd sketch, it's horrible. Even the music acts are terrible now, as half of them aren't even truly "live". Ashlee Simpson was just unfortunate enough to get caught, but I"m pretty sure she is closer to being the rule than the exception. (Example - AFI was on recently, and their backup vocals were a little too good, and then I noticed that even though the bass player didn't quite make it to his mic when he had to sing, his vocal part miraculously appeared.)
I'm fully in the MAD TV camp now which sucks because I have been a life long fan of SNL.