It originally aired on cable, but I watched it via instant streaming Netflix. The miniseries was comprised of eight 44 minute episodes, each centering on a specific two incidents the Kennedy family - one political, one personal (for instance, the Cuban missile crisis and Jackie contemplating leaving her cheating husband).
I wasn't sure what to expect - I have a fascination with all things Kennedy, and a weird obsession with Katie Holmes (don't ask), but sometimes I feel like situations like this are really exaggerated to make the point.
And it WAS exaggerated. Katie Holmes was a visible stunner as Jackie O, and I couldn't get over the timeless qualities of her amazing outfits, but her cheesy, non-authentic accent really grated on my nerves. Joseph Kennedy Sr. was excellently acted, but a scary character. I was intrigued by him, and also a little unnerved. (There was one scene in particular where a Kennedy barely won an election and said something to the effect of "wow, that was the tightest election in history" to which the Sr. Kennedy responded "You think I'd buy a landslide?")
I think it'd be hard to portray a man like JFK - someone so recognizable and popular and loved, but I need to give credit where it's due: Greg Kinnear as JFK was uncanny. There were several moments during "flashback" black-and-white scenes where I was momentarily unsure if it was stock footage of actual events or filmed to look like from that time. He was fabulous.
And speaking of fabulous, I really enjoyed seeing more about RFK in general, and separately his relationships with Ethel (they had ELEVEN children!!!) and Jack.
Overall, I'd recommend watching it if you have the chance. I understand the real Kennedy's objected to the making of the miniseries, and I can't say I blame them. Their flaws are not camoflauged, but I walked away even more interested, intrigued and fascinated.