My feeling now is as if a new artist remixes your favorite song. You have to acquire a taste for it.
A few specific criticisms:
1 I'm not a huge fan of Archer-style animation. The Bruno story came across a bit cheesy to me. Cheesy accents. Beady-eyed Pope caricature, etc.
2 The soundtrack was kind of movie theater generic. I really miss the spectacular Vangelis soundtrack of the original. Actually, I think this might be the single greatest reason why I had a negative reaction at first. The soundtrack didn't leave the same emotional impact as the original
3 It would be easier to accept it for what it is if they didn't eulogize Carl Sagan and remind us that this is NOT the original.
4 Network TV being network TV, commercial breaks really break your focus and are really distracting. I'm used to watching Cosmos on Netflix without breaks.
5 They seem to be over-reliant on CGI to me. Everything has to look really flashy. The quiet reflective dialog scenes, always seem to have a gimmick. Like NdGT holding his ears while the K-P meteor explodes, etc.
I get that I am not the target generation, but still.
6 The message from the president makes it partisan. Conservatives and creationists were already going to attack this, and many might not care about those opinions, but Obama's seal of approval just makes this a bigger target than it needed to be.