If you look at all of the terrible shows CBC has produced, RMR is really a gem. Basically, the plot of every episode sees Rick Mercer going to some obscure place in Canada. He is guided by the staff of the facility, and makes a few jokes along the way. Mercer really has a wonderful comedic personality, and some of the jokes he comes up with are quite clever and entertaining.
What may possibly be funnier than Rick's journeys, are the skits the show puts on; sort of like Saturday Night Live. These are where Mercer's jokes really shine, and they are what make this show extremely entertaining.
This is really a success on the part of the CBC, and I really hope this show keeps airing.