A few years ago, my wife and I watched "Kill Bill" in a movie theater. I remember being essentially entertained my the movie, but I also remember feeling unsettled by the whole experience. After seeing the first movie, I figured that I "might as well" see "volume 2", but there wasn't much urgency.
I found "Volume 2" on TV the other day, and I recorded it. (We watched it last night after the kids were sleeping.) I really liked "Volume 2". It was interesting, exciting, and scary. (Mamba's demise and the claustrophobic casket scene had me on pins-and-needles, but they somehow weren't as unsettling as events in "volume 1".)
I think that -in retrospect- both movies are pretty strong. The second installment helped make the first one more interesting. I suppose that I will watch both of them together some time in the future.