It's still a good and very fun game, if slightly rough on the edges with the porting job. Expected better!
Graphics: 6
The game has very powerful potential in its graphics, but the poor porting job did not fully utilize all that potential. Compared to the console versions, there were more detailed textures and if you have an nvidia card PhysX will also come into play to enrich all the force grips and pushes.
However, one severe flaw is the lack of customization. The only graphical configuration on the PC port is resolution, period. There are no options to change texture quality, AA, AF, Vsync or any other enhancements/tweaks you'd expect out of other games. The end result is that players with older systems will not be able to run the game at their desired resolution without severe lags, since there is no other option to tune down the graphics; players with high-end systems on the other hand will miss out AA/AF/Vsync despite having a system capable of maximizing a game's graphical potential.
Sound: 8
Most of the music tracks came from the Star Wars movies. While it does adds the classical feel to the game, new music tracks would have applied a better effect, for example KOTOR and its music tracks uniquely different from the movies. Nevertheless, even with the classic star wars tracks the game managed to comb them smoothly with the game's action and cinematic and helped to create an immersive experience.
Gameplay: 10
Out of all the star wars games, The Force Unleashed probably has the best combat system for controlling a Sith/Jedi. The combat is fast-paced, progressive and not just clicking attack button the entire way. The apprentice levels up as the player progresses through the game, and with the talent points the player can choose to improve different aspects of the Apprentice's power ranging from lightsaber combos, force powers to basic stats. This game offered some of the best Star Wars moments I've ever had(especially the prelude).
Porting: 6
While the game may be reasonably good on its own, to get into the game you'll have to endure through some horribly ported menus. You cannot use your mouse in the menu, and awkwardly you often have to use "[" and "]" to move left and right in menus.
During the game, upgrading the apprentice's talents or change the crystals of his lightsaber will require tapping into the menu, and annoyingly going into the upgrade and lightsaber options both will lead you to a time-wasting load first. I'm running on a top-end PC and the loading still tend to take roughly 3 seconds every time when I need to upgrade a few talents after a level-up.
Overall: 7.5
The Force Unleashed is still a good game. You'd very much enjoy it too if you have a capable PC. Nevertheless, due to the unsatisfying port, the game probably would be enjoyed better on a 360 or PS3.