You don't need a high powered PC to pull of a FPS masterpeice.
That explains why i left the demo of this untouched for a good couple of months before I finally gave it a try... best thing I ever did.
Rather than insist you do everything one way here you can approcah things from a different angle if you wish, have to get past a droid to reach your goal, you could try and blast it into next week or choose to modify your DNA so your invisible to the droids sensors and just sneak past.
The only real disappointment is that regardless of which faction you choose to follow, and there are 3 to pick from, you still end up going through the same set peice areas, but the enemies you face in the aftermath will vary depending on which faction you upset the most in the process... all this to the point where regardless of how you play through the game there is only really one decision that effects the end of the game, and should you choose to save before you make that decision, you can see all 4 endings by just replaying half the final level.... but then you miss out on all the different reactions to decisions made to reach that point.
Definately worth a go.