That was the weirdest ever, yeah. I feel like the producers were running out of material.
The Nightsisters? Those episode aren't as important, so I recommend skipping them altogether. I, personally, enjoyed the last one where Grievous literally obliterated all of them, but I don't recommend viewing that one either because it was a bit creepy.
Yeah, basically, that group functions more like a cult and I wouldn't recommend watching the first few episode of the Maul-returns series of episodes. Other than that, they're pretty much the worst of it.
As for The Ones thing, I never really got it either. I don't recommend watching those few episodes as they were boring and didn't really mean much for the rest of the series in general.
So yeah, just avoid those few episodes.
As a warning, though, Anakin and Padme occasional kiss. Some other characters do too I think, but those scenes are few and far between. Lastly, the series actually gets darker towards the end. So get ready for a few tears and ripping-your-hair-out-because-the-world-is-so-unfair-and-cruel events.