This was my take as well. TNG was very progressive but they were very good at making sure the episode was a good story first and social commentary second (not all episodes but many.) TOS was more overt but it was the 60's and television wasn't nearly as sophisticated as it is now.I've seen every episode. It's just so... weird...
It doesn't feel right for some reason. It's just off somehow. I can't really explain it. The tone isn't really right? The sets are too cavernous and big. The themes are too simple for an hour-long show... there's a lot of "air" in it... Dunno. I watch, sure, but I don't quite get it yet.
Orville gets it right in some episodes but in others it totally bangs us over the head with the social commentary with all the subtlety of a bulldozer. Obviously TNG was very clunky its first seasons too, so maybe the show will get better at their formula and delivery as they go.