I think that’s quite good when comparing it to how other shows in the same time slot fared We also have to remember it was just the pilot, whereas other shows that did better are fully established brands. The only solid fan base ThunderCats has right now is the 80’s fans.
They really need to repeat the pilot in the afternoon sometime (after School) so the younger children can catch as well. I bet most of the kids that have watched it, was because the parents had recorded it for them.
So yeah I think it’s a solid start and hopefully the audience will grow. It’s still early days yet.