The'missing link' of the film trilogy, The Force Unleashed satisfies with a brilliant story, and intense force action
At the beginning of the game, Darth Vadar is sent to destroy a Jedi who escaped the dreaded order 66, only to find a force adept son. Taking the boy in, the Sith Lord trains him with the ultimate goal of bringing down the Emperor in the only way a Sith can. So, you go into your first mission as 'Starkiller' (see what they did there?), and it feels great.
The combat in the game is at first glance very simple, due mainly because most of your abilities are restricted to Force Grip and Force Push. After the first level as Starkiller, you acquire Force Lighting and so on and so forth. As the game progresses, you can level up with experience points gained from beating the various enemies the game throws at you. This gives you three different kind of orbs, which, allow you to unlock fighting combos, force talents, and finally, to upgrade your existing force abilities. As the game moves on further, the combat becomes varied, giving you the option to unleash the full fury of The Dark Side in any given manner.
I can't say enough good things about the combat, and how fun and exciting it is. However, sadly it sometimes takes a back seat when you have to fulfill certain tasks in order to move on (i.e destroy certain number of generators etc.). I felt these objectives really brought the game to a halt. In the opening levels, you push your way through a defensive line until the end boss, though, in the later stages, you're forced to preform these objectives, deferring from what the game does best.
That said, there isn't much negative things I can add about this game. The music is, as expected, up to par. The twists and turns of the story actually feels like a Star Wars film, without the amazingly droll melodramatic acting.
I'd suggest it as a rental, though, if your big into Star Wars, go and buy it. It won't take long to breeze through the game on a lower difficult setting, but there are some unlockables some might enjoy hunting down and finding.