I generally agree with a lot of the responses here, but also have this to add. In alpha/classic, the general pacing was much less frantic. It was more of a strategic combat playstyle, and much less of a twitchy reflexes-based affair, like it is now. As a result, there is not time for the builder to put together ingenious and/or large constructions. The pacing is such that the only way to put something together in time is to follow a bunch of tried and true best practices, rather than coming up with your own design on the fly. The result is that all of the buildings look the same. They are the most efficient, mindless, and quick to build. Doing anything else would be doom for your team; you'd run out of resources (because they're so limited, as others mentioned), you'd not be finished by the time the enemy came knocking (because the pacing is dramatically faster and more twitchy), and your teammates would rip on you for deviating from the norms (due to many unsportsmanlike community members). In addition to all those points, constructions are highly fragile by comparison to alpha. Every class has ways to make a building into rubble all by himself in seconds (ironically, the builder is the slowest at this!), so builders probably don't see the point in spending the time on building an ingenious fortress, because the next time an opponent so much as looks at it funny, it will fall over. Fun building is one of the unfortunate casualties of the game's current direction. I think @Strathos put it best when he described current building as more of a chore that has to be done, rather than a fun diversion. Sorry to be the bearer of bad news.