The Camelot characters weren't great but the way they were simply forgotten was amateurish, even for this show.
This episode should have been split into at least two, the Dark Ones were pointless and did nothing and everything was rushed and predictable. It trivialized everything that happened in this arc. This arc was just designed to be a big ol' reset button and it's so annoying because they could have done so much more with it. Rumple becoming the Dark One again is stupid and it just made these eleven episodes even more pointless than they already were. This has been the worst arc they've ever done in this show. Woeful.
I'm really not bothered about 5B at all any more.