Lol, I love those maps because you can create chokepoints with rocks and shit. However, I believe the map selection is relative to where you are, if you're in Russia, yeh, it's likely to be forest. If you're in Sahara, it's going to be empty dunes.
Actually, starting with someone like the Soininke, isn't that bad. I started with Irish and Ivar the Boneless with 6k troops holding Dublin is kind of a problem.