I love this game! You can interact with so many items and people, and your actions dictate whether you become evil or good, each with its advantages and disadvantages. The combat is great fun, with lots of options (e.g, head shots, crippling limbs, destroying and enemies weapon etc). There are loads of weapons to choose from, and also armour and helmets.
You have to buy this game! When I first started playing it I couldn't really get into it, as I didn't understand the full potential of combat, but now I'm addicted. I've almost finished the main story mode, but there are loads more side quests to complete still. Extremely fun game!