I think the point of this show was to give you the cast you know and love from other shows in the most outrageous scenarios possible, and it delivers. Very funny, very unpredictable and everyone involved did a great job. The mystery is not the most important thing in the show; it's about the journey not the destination. I will confess to mostly watching for Pond and not knowing the others as well but I was very impressed by all the casts' commitment to the craziness.
Do expect to have to cover your face over and over from the character's embarrassing themselves.