Only SNL could have DeNiro host, Robin Williams and Ben Stiller make cameos, and under utilize all three. Yeah, DeNiro sticks to the cue cards like glue, but it doesn't matter if its written well and funny.
And to jam Williams into a guest spot on an overdone repeat sketch and then not use him again is ridiculous. Give him 3 minutes on Weekend Update just to riff. I'm sure he can come up with a dozen lines about WikiLeaks faster than it takes Seth Meyers to blink.