I'm not an expert but I am writing a game using DOD and ECS, in Java, for Android, and it's a 2D game so performance is not an utmost concern. I can say that using the ECS pattern and being data-driven has absolutely saved my bacon and made the dev process so much easier. Tricky things, like adding new enemy or elevator behavior, have turned out to be not so tricky when I get to the implementation bit, because the ECS makes things orthogonal when they would be tangled up with each other in a strictly OO model.