While it is a game worth playing, Lord of the Rings: Conquest becomes boring after you finished the two storylines. You can still have fun playing at single-player maps, but that will not last for long. Your best bet is to start playing multiplayer online, it is much more interesting.
The game has a rather good gameplay. Trying the game at different levels of difficulty is a good way to make the game give it's best. The selection is good, such as been able to play as the Balrog. The evil campaign is a good idea too, it gives the game much more interest.
In the end, it is a game worth buying, but don't expect to keep you satisfied for too long. It should last about 1 to 2 months.