The maps are awfully bland, all the work seems to of gone into giving the maps a pretty background, which add nothing to gameplay except graphical lag, all of the maps are flat roads with towers on, that is all there is, nothing more, no interactive scenery, no height changes, none of the terrain can move, none of the terrain can block line of sight, none of the terrain does ANYTHING.
I do not see why it would be "expensive" to create them, all the maps are is roads with textures on and a very detailed uninteractive 3D background, drop the background and hey presto you only have to make a few textures and draw a shape with towers on, how much are GPG getting paid to design flat featureless maps? Because someone like Scottish Alien should be getting double their salary.