They're great, although when I think about it, they're individually practically unlistenable for me. With Chris Russo's hyperactivity and irascibility and Mike's lunkishness, I don't know how I ever managed to listen, but I was usually very entertained. I agree, their conversations about likely ratings of various events were completely pointless and unexpected but somehow engaging. Interviews with a Whitey Herzog or a Fay Vincent were particular treats.
I loved Tom's mimicking of Mike and the putative average caller to the show. Chris and Mike are both so ripe for parody.