For me, the barrier to appreciate an animation is higher than to appreciate a still scene. This means that for most games, animations actually lessen the immersion on the game (particularly the 5 frame low effort animations some devs produce). Good animations may hold my interest, but I'd say most of the times they break the flow of the game, and as such are not worth it.
Either put in a good animation, or do no animation and spend the effort on expanding the game in other ways. Mid or poor animations don't contribute to a scene, IMO.
I prefer animated games. I do not mind still images if there are many for a single scene. I hate it when there is a lot of dialogues in the same still image.