The humans are interesting, I think this might be the only time you see human faces until late season 3.
Annoying Pipkin...I have mixed feelings. At first it's kinda funny, but by the end of the episode you're just as annoyed as Bigwig

I'm glad this was a one-time thing and he wasn't annoying most of the time.
One of the frustrations I had with the series as a whole is that it had some good ideas, but didn't implement them very well, and the Redstone back story is one of them. It seems like there should be more but they didn't quite have enough time for everything.
I mostly agree that there are several subplots they could have handled better, Redstone being one of them. But they decided to waste half of season 2 with pointless fillers rather than actual interesting worldbuilding.
Hearing more about old Redstone could be great, and Captain Broom frequently tells stories about it, but sadly nobody listens, so the audience never gets to hear more than a few random facts.