I haven't seen this dinosaur episode. Personally, I think it gets a bit better after they give Cheryl more of a personality. She's hilarious. It was amazing right from the start though.
Oh god, Cheryl's great. I'm only at episode, like, 10 of the second series (the Family Fortunes scene was just incredible) but she's possibly my favourite character after Archer. The constant degrading of Pam by everybody is like their answer to Family Guy's Meg jokes, but actually consistently funny.