I think for the most part the builds on the map are too simple looking. The catapults are what really got me, they just look too bland. Same with a lot of the houses.
Also, the terraforming looks too well rounded. The chances of it being as perfect as that are really low. It's also really flat, and though I know it's intentional, it's unrealistically flat and extremely boring looking.
The cornucopia on the edge of the map doesn't really appeal to me. When you're starting the game, if you're not gonna go to corn you're at a disadvantage because you're so far away from the rest of the map. Someone that spawns closer to the more open area of the map has a massive advantage there. I know it was trying to be unique, but that's probably an important reason on why it hasn't been done up to date.
I'd say the best thing you can do to improve is move the cornucopia to the centre, make the terraforming look less perfect, round and flat (add some hills or something) and make the builds less flat too.