I agree that it was 90% great and 10% crap.
Fallon and Timberlake's intro was great. Jeopardy killed it. As a skit, I always liked The Californians, but this one went too long and adding the "buh-bye" flight attendants at the end of the skit was just dumb and awkward. All the video clips were great and the Sandler/Samberg video about laughing during the skit had me rolling. The other celebs doing their favorite characters was good, except for Emma Stone's Roseanne Roseannadana, which was pitiful. After the great tribute by Chris Rock for Eddie Murphy, I can't believe Murphy didn't something more meaningful or comedic already set up and ready to go. He failed, very much like his last 5 or 6 films. I also liked the audition tapes, and Jim Carrey doing Post-Nuclear Elvis was hilarious!
Finally, the music guests were horrible. Sorry, but Paul McCartney is starting to sound like an old man. Why the hell invite Miley Cyrus to do a Paul Simon song and Kanye, who was ridiculous with the singing from the floor "art." The guy is becoming a full-blown douche bag before our very eyes. Paul Simon closing with "Still Crazy" and his recognition of the SNL band was a nice touch and he sounded pretty good, but his voice is also starting to show his age as well.