I've been house-sitting/dog-sitting for a friend for about a week now, and I gotta say, MLBN isn't that impressive to me. I can get just about the same thing from ESPN and there are a ton of re-runs of stuff, ironically about like ESPN.
As much of a baseball fan as I am, and as excited as I was to see what all the hub-bub was about, I am finding that I am spending less and less time paying attention to the channel as the week went along. Maybe it will get better, but at this point if Dish carried it and it was in the package about what I had, personally I wouldn't shell out the cash for the upgrade... but that's just me.