I hear ya Conestoga, one of the reasons why I don't play OP2 much now-a-days is because of how boring the current maps are.
We don't really have any maps that are big, but have Plymouth (or Eden) attack you. Likewise, all of them have objectives that either have you fleeing from the blight or have you building your colony to a certain point. Personally, I'd love a good big map where you can just fight and build, not have to worry about anything except for plausible disasters (like Tornados, earthquakes and the like)