exactly. flat ortho is boring but ortho (at least ortho4xp) comes with updated mesh and that makes the difference.
fortunately there are some ways to correct it available for some regions. e.g. freeware x-europe addon which provides osm data for roads and buildings (and trees also iirc). then the blending of ortho and 3D objects looks little more seamless.
edit: I have to mention that I use also payware global forest addon on top of it for the correct diversity and placement of trees (osm data also iirc). wish that osm data has also grass and bushes info.
swiss alps near Sion