In fairness, that is pretty much the same architecture they had in the temple level from Goldeneye. I guess what you have to remember is that the game came out what? Seven years ago or something? Things have moved on, and that kind of architecture looks kinda dated now. Also, the texturing repeats really badly, instead of covering up the basic architecture like they did in Goldeneye, it kind of makes it more obvious.
How about trying to bring out a version two where you take this level as a base and try to add some pazzaz and architectural detail to what is already there?