I'm a big fan of both the books and the movies, and now this game! It is fun to play, and challenging yet not too challenging. The graphics are spectacular, and the live action movie shots make you feel like you're really there with the characters. I would recommend this game to anyone who likes Lord of the Rings!
Also, the title is a little misleading; the game doesn't take place just during the Two Towers plot, in fact you play out scenes from the first film as well, and the very first scene you play is actually as Isildur fighting with the last alliance of elves and men. Both scary and breathtaking when CGI Sauron turns into the live action version of himself!
Based entirely on the film, unlike the Fellowship of the Ring game, this game perfectly blends gaming with film footage, and is a joy to play. It is never boring, and each new level advances you significantly through the story.
As for the characters, Aragorn is the main one here; you can only play him to fight the Nazgul at Weathertop (they are scary, but it's great when you set them all on fire!) and he is the most well-rounded character to play, having especially good fighting skills. Gimli is great with his axe, and can chop enemies down to size in one go, but he's not so great with the running. Legolas is your best bet if you're good with shooting and evading, but he isn't very strong in combat. Although all the characters available to a level can win that level, sometimes certain characters are suited better to each.
All in all a fantastic gaming experience, definately one of the better games out there on the shelves.