MS Publisher is great for quick and easy projects. It quickly becomes bogged down if you have lots of images though. It doesn't flow very well with adjusting images though, as you need to remove each image, edit it elsewhere, and then add it back in. Affinity has the "personas" to make it flow much better.
I still use MS Publisher as it's text support (especially for non-Romance languages) is great. A lot of it's great features come from it sharing a base with the other Office programmes.
My main gripe with it though, is that while Microsoft still support it, they have added almost nothing to it in years. With Office 2019 being basically a sum up of the changes to Office 365, Microsoft only mentioned Publisher as a "it also includes this" thing. I get the feeling they don't see it as a serious publishing programme and consider it 'done' now. To be fair, as a casual programme it is fine and actually quite feature rich.