Well, even as they are now in the game, forts in general would be more effective if it wasn't so easy to get onto the walls, if the wall cannons actually worked and could hit things, and the defenders got some sort of bonus on the walls.
Sadly, as far as I can tell, it's still far more effective in the European forts to simply garrison the buildings inside, or stick a cannon crew on the flagpole and let them fire grapeshot at anybody who gets near. The non-European factions get a little screwed in that respect, since all of their buildings are too far from the center to fire on units taking the flag.
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