Although I cannot argue with the former comment about this miniseries a bit boring, I feel it's also misleading. Certainly, it needn't have been 4 hours long, but if you look past that, and watch it as the costume drama it is, you'd probably enjoy it. The sets are magnificent, and the acting isn't as bad as the former comment suggested.
But what is stunning is Barnum himself, and all the things that we take for granted, that he started or invented - like Madison Square Garden, the permanent circus, the terms "rain check", "grandstanding", and "press conference" (as well as the very notion of a press conference), but also modern advertising - including full page ads, creating a demand, and infotainment. That's the real strength of the miniseries - Barnum's optimistic view of the world and his ideas of marketing and showmanship.
So, if you're interested in how show business started to be a legitimate business, you should see it, even if you shouldn't place it at the top of you "to watch"-list.
