I'm with you on jumping around, as I strictly play with mouse and keyboard and have zero controller experience. But from what I can gather, those are animations. The player simply gives their command to their character, and based on the action chosen the game puts in the appropriate animation. So the player isn't necessarily jumping around.
Also, based on interview material, the player does get a lot of control over the party members during combat, and can issue orders to them. Or else, have the AI run them. It's our choice. But they didn't show this feature in the trailer because it's a trailer. Party size though is now down to two companions instead of three, which I'm not happy about.
That's good. I hope future gameplay videos will go into more detail about how the combat works.
As far as only having two companions, well, let's just say that none of them really excite me besides possibly Lucanis. And I sure hope he doesn't act as gay as Astarion.