yeah.. in most of the "real life" battles I've ever hosted, I spent huge ass amounts of time working on building nice buildings, and then nobody ever goes inside of them because it's too hard to access them and you can kill people just as well from outside of the buildings anyway. So theyend up just being scenery and not really adding to the game at all because people just walk around them.
Having one really big fortification that sort of encompasses most of the battlefield seems to be a pretty good solution though, although it also gives a huge advantage to "defenders" . It's also interesting in this battle how some of the attacking forces seem to start "inside" the fortifications, or at least some of them.
Also, the walls are pretty hard to break down, so they have the effect of herding infantry to certain places, so with enough foresight, traps and secret doors could be incorporated to advantage players who are paying more attention and thus making the game more fun.
Another aspect in a "defending" sort of scenario, part of the defending army is often completely out of range of the attacking army for the first half of the game, which is rather unfortunate, but seems to have been avoided here, as I haven't seen any figs just standing around doing nothing.