My experience also. I've worked with 3 different ones and I think the domain fit was good for only one of them. In that one domain model, the fit was spot on because that domain was just a bunch of events and every question you asked of the domain model was really saying "create me an object with the events between time X and Y". That was it tho, all other domains I've worked on would not suit ES - even though they would suit CQRS without the ES piece.