Rob did very well. Obviously, since hes new to snl, he is given all the straitman roles, which he didnt do a bad job of at all. He did a lot better with those roles than what i usualy see on the show. And he did have a funny part in the fake comercial.
Its not a balanced opinion though because Im so used to seeing him perform, its like when he just stands there and does nothing im usually cracking up anyways. hes just a very funny guy. I do think he has a shitload of potential to become snl's top dog in a year or 2. Hes a very versatile comedian, he can play a lot of different stuff, and can do it all very well.