A great and fun game, whether your playing by yourself or online!
This is what the modes are:
Good campaign: You go all the way from moria to the black gate as the fellowship. But you will also be controlling Rohan and Gondor forces as well, as they try to reclaim their lands.
Evil Campaign: Stop the fellowship from destroying the ring, while crushing Rohan and Gondor.
Skirmish: A simple battle. You can set diffuculty from Easy to Hard, set the teams, select maps.
You can even make your own maps with Worldbuilder! Worldbuilder comes with the game, and you can build some really good maps.
Online Multiplayer is just like a Skirmish, except with real people.
I never get bored with these modes. Its just an all round good game. The only thing I dont like is that after a while, you can predict what the AI on skirmish is going to do, so you counter it straight away.
So if your thinking of buying this game, buy it!