It depends, there are games I play for the dialogues, there are games I play for the scenes. There are also those in which both the dialogues and scenes are great, such games are the best.
I think this is the future, especially when AI develops and it will be possible to generate porn indistinguishable from real ones. Then I will play such games, but for now I haven't found a good game with real porn
I can live without animations if the game is very good (graphics + story), but I treat it as a big minus and by default I look for games with animations.
Unreal and Unity, but that's because people try to use them to create VNs when RenPy is ready next door. And never Unity/UE games have all the features that Rnpy provides. If developers didn't try to create VL on engines not designed for it, the games would be better.