3.9 is good, but I expected it to do a lot better. It only got about 10% more viewers than the SpongeBob repeat preceding it.
Still, if it can hold on to enough of those viewers (there's usually a drop after the premiere) it should still be a strong performer for Nick. Maybe not as strong as Korra, but hopefully more consistent and longer-lasting (Korra was a bit unpredictable ratings-wise and also wasn't that strong in key demos - it skewed more to an adult audience).
Bear in mind that it's not the total viewers that will decide this show's success, but it's performance in kid demos, since that's what matters most to Nick. I'll post those numbers when they become available later this week.
