Quite fun despite its flaws
The campaign proceeds along a map of Middle-Earth roughly tracing the steps of the Fellowship. It's neat because it adds things that werent necessarily in the movie, and also has bonus levels along the way that you can skip, but shouldnt, because theyre fun to play and level your characters up in.
I never found the game repetitive because in each level, the locales changed so much that there was also a different way to win. Furthermore, after you're finished playing one side of the LotR story, you can play the other, following the same story, but different enough to make you want to play it again.
I would stress that any LotR or tactics/strategy fan get this game as it offers a rewarding experience.