I knew Supergirl would drop quite a bit. That is quite a large drop, but tbh it was inflated by Big Bang in it's premiere.
Big Bang moved back to Thursdays yes?
It's interesting to see Murder dropping quite a lot this season and being at 1.8 at it's latest episode. Still a winner though.
I'm wondering when Secrets and Lies is returning? I never watched it but it was the surprise hit of last season. It started at 1.6, averaged 1.4 and then it's last three episodes got 1.5, 1.7 and 1.8. And that was on a Sunday! If it was moved into Nashville's slot after Blackish, surely it could get around 1.8-2.0 weekly, that would make it almost one full ratings point above Nashville (which usually gets like 1.1).
FOTB, I'm happy that after it dropped to 1.4 two weeks back, that it climbed to 1.5, hope when we see the ratings later, it would have climbed again, doubt it though!
CW is interesting this year. Jane has dropped a bit, where it hit a .3 the week gone past which was worrying, but recovered to .4 in it's latest episode. Arrow seems to (as always) stuck on the 0.9-1.1 level which for a show in it's 4th season, is incredible impressive (especially since S1 was getting the same level). Supernatural grew to an impressive 0.8 last week.... a show in it's 11th season!!

TVD is now stuck in the 0.6 level, and may drop to 0.4 by spring.
The Flash as always is stable as anything!
As for NBC. They are having a awful season bar TV, and it's lead outs. But special mention to Chicago Fire (which I started watching for the first time 3 days back, and loving it). A 1.9 in it's 4th year in the failing NBC is great at 10pm.
Also, Grimm.... I LOVE the show, and it returned above what I expected at 1.1. But sadly it will go fractional from now on. I think the 2nd half of S4 harmed the show quite a lot last season. But I LOVED the S5 opener. I really hope it can hold on, but going by Grimm's history, it always falls. Wish we could see the usual S3 type 1.3-1.4 demos but we will never see that again.