I agree that there's something different about it. I'm very glad I got Helm's Deep, but it is both literally and figuratively, on the other side of the room from all my classic castle sets. This is my first licensed theme, and therefore the first sets I've gotten that are beholden to specific scenes from reference material. I do have to say, it is the most interesting, unorthodox build I've ever done and is filled with cool parts.
An unexpected joy is stocking it up with castle minifigs that fit with the LOTR style. In fact, I think I'm going to hit up BrickLink soon to flesh out the ranks to man the battlements. For instance, the Kingdom's Lion scale mail archer torso is a pretty good fit with the Rohirrim, as is the neck-protector helm. I just need to get more fleshie heads and hands to do it.
http://i40.photobucket.com/albums/e244/ ... sDeep4.jpg