I've really been enjoying Duviri story wise and gameplay wise. I know I've had several people talk about how much they loved Zariman, I like the new modes but the tiles themselves are a bit much for me personally
I really wish they would rework the Corpus Railjack missions. They feel more like you're just flying a taxi to start a regular star chart mission, while the Grineer missions actually feel like a different experience from the base stat chart.
I also liked that in the Grineer missions, objectives can be done in parallel if you're playing public, unlike the Corpus missions the entire squad is gated by a timed side objective, and requires the entire team to start the main objective.
Yes, Corpus Railjack nodes should all become Skirmish, like the Grineer nodes. There's a good variety of main objectives on skirmish already, I don't see why someone would go to Railjack wanting to play Survival or Defense.