My wife and I bought and watched the full original 6 over about a week a couple years back (before we had kids, obviously). It was enjoyable. I think the original three are pretty great.

We did have to decide whether to watch it in episode order (1,2,3,4,5,6) or release order (4,5,6,1,2,3). We decided on release order, but this is something that people debate.