The main advantage of the new map is that it can be zoomed and panned. This gives you the view you need, when you need it, instead of a giant image that may or may not work nicely.
We also want to give people a better feedback. And honestly, I am a big fan of the Realms view - it gives me a much, much better impression of the land covered by a realm than the icons.
But the big thing is that we can extend this with more things. Trade maps, religion maps - some of this already exists, but it's ugly and not very useful. Now we can make it really well.
But if there is anything aside from change that you dislike about the new dynamic map, let us know and we'll find ways to improve it. I know the information the old one displayed about starvation, fortifications, etc. isn't there yet. But it's coming.