Let me answer this by telling you my situation. Take from it what you want.
Once in a while, my mother will take the kids for an overnight so my wife and I can have some time together. I started to learn that the benefit we received from having kid-free times in our marriage were not worth it because my mother would attempt to “spoil” them. They eat nothing but crap, are not required to do any cleaning up or chores, are allowed to stay up really late, and hardly get any exercise. This results in kids that are cranky and just feel horrible. They can’t sleep due to the lack of exercise and disgusting carb overload, yet they feel so drained of energy that they are unable to even get themselves ready for school or do their normal activities that make our household work. It takes days before they’re back to “normal”.
So, is it “spoiling” to carb-load my kids and not demand that they get exercise and help with chores? I don’t actually think so. The term “spoil” and kids is rather meaningless, but I think I get the motivation. There’s a desire in my mother to make the time so incredible with her that they remember these days for the rest of their life. In a sense, it’s an attempt to allow the kids to live in a fantasy world of sugar with no worries or concerns, and no obligations to anyone else. I get this.
But here’s the problem – what is it really doing for my kids? It certainly isn’t helping them feel better. I’m talking about physical well-being here. They are crying, exhausted, and have a stomach ache when they return. I know it’s simplistic, but in a way it feels like my mother takes the kids and they all go shoot up for a weekend. By the time we get them back, they are having to go through the early stages of detox, and it isn’t pretty.
Besides the physical component, I have a problem with my mother completely stripping any responsibility from my kids while they are there. At our house, my kids don’t do chores merely to be kept busy. They are learning valuable skills, sure. But they are also learning what it takes for a household to function. They are learning what it means to work cooperatively and for the common good. If they don’t do the dishes, we don’t have clean plates for dinner and therefore can’t eat. For them to expect us to do everything for them is not beneficial to our house and family. And more importantly, having expectations that they contribute has benefits to them as people.
Anyway, I don’t mean to imply that any of this is directly-relevant to your situation, but it came to mind when I read your question.
Maybe it’s time for a long conversation with your ex to come up with concerns you both have and maybe a game plan for finding those areas which are important to both of you. Consistency is rather important for most kids. But there are also times that all rules and responsibilities are thrown out the window.